FILE: Sleep · OPENED JUL 9 2026 · REV 2 LIVE FILE

Sleep Research Desk

What the evidence shows about sleep duration, timing regularity, and tracker accuracy — rated by strength of evidence, updated as new studies publish.

sleep hub Evidence files: HRV·RHR·VO2 Max·Wearable ECG·CGM·Recovery·Activity·Blood Oxygen·Respiratory Rate·Stress·Temperature

Does short or insufficient sleep duration associate with adverse health outcomes?

KnowYourPrime evidence rating Established Strong, consistent evidence supports the claim.

Adequate sleep duration and quality are associated with better cardiometabolic, cognitive, and overall health outcomes.

Systematic-review or meta-analytic evidence affirms the core relationship.
Multiple supporting studies are consistent with the core relationship.

What would change this rating

A new core-hitting conflicting study, a retraction of an anchor, or a failed replication would lower this rating.

52 studies scored · 6 anchor · 44 supporting · 1 null-result · Last reviewed Sep 4, 2026

How accurately do consumer wearables measure sleep versus polysomnography?

KnowYourPrime evidence rating Uncertain Evidence is conflicting, inconsistent, or difficult to interpret.

Consumer wearable sleep trackers measure sleep accurately enough to be meaningful for everyday users.

Anchor-grade evidence affirms the core relationship.
Multiple supporting studies are consistent with the core relationship.
An anchor study is present but its own reported finding does not cleanly affirm this claim, so it does not count toward the Established threshold.
A clean anchor supports this claim, but an unresolved conflicting study contradicts it on the core relationship, so the evidence is treated as in genuine dispute.
Some evidence conflicts on secondary points that do not change the core direction.

27 studies scored · 8 anchor · 17 supporting · 2 conflicting · Last reviewed Sep 4, 2026

Is irregular sleep timing independently associated with adverse health outcomes?

KnowYourPrime evidence rating Established Strong, consistent evidence supports the claim.

Regular and consistent sleep timing is associated with better health outcomes independent of duration.

Systematic-review or meta-analytic evidence affirms the core relationship.
Multiple supporting studies are consistent with the core relationship.

What would change this rating

A new core-hitting conflicting study, a retraction of an anchor, or a failed replication would lower this rating.

7 studies scored · 3 anchor · 4 supporting · Last reviewed Sep 4, 2026

Studies in Pool84

Claims Rated3

Last PubMed SyncSep 4, 2026

Next Scheduled ReviewSep 11, 2026

17 systematic reviews 4 RCTs 40 observational 2 validity studies 21 other

MAINTAINED BY The KnowYourPrime Research Desk · reviewed against new evidence on a rolling basis

Evidence for: Adequate sleep duration and quality are associated with better cardiometabolic, cognitive, and overall health outcomes.

52 scored

Anchor Studies6

Sleep duration and health in adults: an overview of systematic reviews.

Journal

Applied physiology, nutrition, and metabolism = Physiologie appliquee, nutrition et metabolisme · 2021

PMID

33054337

RCR

19.3

Citations

270

Study type

Primary study

Sample size

[ not stated in the abstract ]

accidentsadult

Sleep Duration and Quality: Impact on Lifestyle Behaviors and Cardiometabolic Health: A Scientific Statement From the American Heart Association.

Journal

Circulation · 2017

PMID

27647451

RCR

36.2

Citations

822

Study type

Review

Sample size

[ not stated in the abstract ]

activities of daily livingdiabetes mellitus, type 2

Impact of sleep debt on metabolic and endocrine function.

Journal

Lancet (London, England) · 1999

PMID

10543671

RCR

75.6

Citations

2,554

Study type

Clinical trial

Sample size

[ not stated in the abstract ]

adultanalysis of variance

The cumulative cost of additional wakefulness: dose-response effects on neurobehavioral functions and sleep physiology from chronic sleep restriction and total sleep deprivation.

Journal

Sleep · 2003

PMID

12683469

RCR

62.8

Citations

2,090

Study type

Randomized controlled trial

Sample size

n = 48

adultchronic disease

Role of sleep deprivation in immune-related disease risk and outcomes.

Journal

Communications biology · 2021

PMID

34795404

RCR

31.3

Citations

405

Study type

Review

Sample size

[ not stated in the abstract ]

disease susceptibilityhumans

Multidimensional Sleep Health: Definitions and Implications for Cardiometabolic Health: A Scientific Statement From the American Heart Association.

Journal

Circulation. Cardiovascular quality and outcomes · 2025

PMID

40223596

RCR

25.9

Citations

Study type

Review

Sample size

[ not stated in the abstract ]

humansunited states

Supporting Studies44

Sleep physiology, pathophysiology, and sleep hygiene.

Journal

Progress in cardiovascular diseases · 2023

PMID

36841492

RCR

59.7

Citations

353

Study type

Review

Sample size

[ not stated in the abstract ]

humanssleep hygiene

Sleep: The silent hero in cardiometabolic health.

Journal

Nutrition, metabolism, and cardiovascular diseases : NMCD · 2025

PMID

39643476

Citations

Study type

Review

Sample size

[ not stated in the abstract ]

humanssleep

Sleep and Risk for Heart Disease and Stroke.

Journal

Arteriosclerosis, thrombosis, and vascular biology · 2026

PMID

41884894

Citations

Study type

Review

Sample size

[ not stated in the abstract ]

humansstroke

"More Kairos, Less Chronos": Sleep, circadian rhythms and the path to cardiovascular, neurological and metabolic protection.

Journal

Diabetes research and clinical practice · 2026

PMID

42323169

Citations

Study type

Review

Sample size

[ not stated in the abstract ]

humanssleep

Sleep and Athletic Performance.

Journal

Current sports medicine reports · 2018

PMID

29135639

RCR

10.6

Citations

169

Study type

Review

Sample size

[ not stated in the abstract ]

athletesathletic performance

Performance of wearable finger ring trackers for diagnostic sleep measurement in the clinical context.

Journal

Scientific reports · 2025

PMID

40108409

RCR

2.1

Citations

Study type

Primary study

Sample size

[ not stated in the abstract ]

humanspolysomnography

Sleep-A brain-state serving systems memory consolidation.

Journal

Neuron · 2023

PMID

37023710

RCR

29.6

Citations

222

Study type

Review

Sample size

[ not stated in the abstract ]

memory consolidationsleep

Slow-wave sleep: From the cell to the clinic.

Journal

Sleep medicine reviews · 2018

PMID

29490885

RCR

9.8

Citations

187

Study type

Review

Sample size

[ not stated in the abstract ]

cognitionelectroencephalography

Both slow wave and rapid eye movement sleep contribute to emotional memory consolidation.

Journal

Communications biology · 2025

PMID

40123003

RCR

6.2

Citations

Study type

Primary study

Sample size

[ not stated in the abstract ]

memory consolidationhumans

Is glymphatic clearance the secret to restorative sleep?

Journal

Brain : a journal of neurology · 2026

PMID

41325105

Citations

Study type

Review

Sample size

[ not stated in the abstract ]

humansglymphatic system

Local modulation of human brain responses by circadian rhythmicity and sleep debt.

Journal

Science (New York, N.Y.) · 2016

PMID

27516598

RCR

6.1

Citations

145

Study type

Primary study

Sample size

[ not stated in the abstract ]

adolescentadult

Effects of six weeks of chronic sleep restriction with weekend recovery on cognitive performance and wellbeing in high-performing adults.

Journal

Sleep · 2021

PMID

33630069

RCR

2.2

Citations

Study type

Primary study

Sample size

6 women

adultattention

Sleep extension and cardiometabolic health: what it is, possible mechanisms and real-world applications.

Journal

The Journal of physiology · 2024

PMID

38268197

RCR

3.7

Citations

Study type

Review

Sample size

[ not stated in the abstract ]

humanssleep

Estimating individual optimal sleep duration and potential sleep debt.

Journal

Scientific reports · 2018

PMID

27775095

RCR

3.2

Citations

Study type

Primary study

Sample size

[ not stated in the abstract ]

adrenocorticotropic hormoneadult

Banking sleep: realization of benefits during subsequent sleep restriction and recovery.

Journal

Sleep · 2009

PMID

19294951

RCR

6.4

Citations

182

Study type

Randomized controlled trial

Sample size

[ not stated in the abstract ]

adolescentadult

Sleep duration and quality, physical activity and cardiometabolic multimorbidity: findings from the English Longitudinal study of Ageing.

Journal

Scandinavian cardiovascular journal : SCJ · 2025

PMID

40832810

RCR

2.2

Citations

Study type

Primary study

Sample size

3,428 participants

humansmale

Associations of Sleep Quality with Life's Essential 8 Cardiovascular Health Score and Metabolic Syndrome Among US Adults.

Journal

Metabolic syndrome and related disorders · 2025

PMID

40537094

Citations

Study type

Primary study

Sample size

n = 3,293

humansmale

Performance of consumer wrist-worn sleep tracking devices compared to polysomnography: a meta-analysis.

Journal

Journal of clinical sleep medicine : JCSM : official publication of the American Academy of Sleep Medicine · 2025

PMID

39484805

RCR

6.3

Citations

Study type

Meta-analysis

Sample size

[ not stated in the abstract ]

humanspolysomnography

Dose-response relationship between evening exercise and sleep.

Journal

Nature communications · 2025

PMID

40234380

RCR

13.2

Citations

Study type

Primary study

Sample size

[ not stated in the abstract ]

humansexercise

The effect of caffeine on subsequent sleep: A systematic review and meta-analysis.

Journal

Sleep medicine reviews · 2023

PMID

36870101

RCR

29.2

Citations

149

Study type

Meta-analysis

Sample size

[ not stated in the abstract ]

humanscaffeine

Slow breathing techniques before bedtime and the effects on sleep: A systematic review.

Journal

Sleep medicine reviews · 2026

PMID

41886931

Citations

Study type

Systematic review

Sample size

457 participants

humanssleep duration

Modulating overnight memory consolidation by acoustic stimulation during slow-wave sleep: a systematic review and meta-analysis.

Journal

Sleep · 2021

PMID

33406249

RCR

4.2

Citations

Study type

Meta-analysis

Sample size

[ not stated in the abstract ]

acoustic stimulationelectroencephalography

Linking Light Exposure and Subsequent Sleep: A Field Polysomnography Study in Humans.

Journal

Sleep · 2018

PMID

29040758

RCR

5.2

Citations

101

Study type

Primary study

Sample size

[ not stated in the abstract ]

actigraphyadult

Good sleep, bad sleep: a meta-analysis of polysomnographic measures in insomnia, depression, and narcolepsy.

Journal

Biological psychiatry · 1993

PMID

1467388

RCR

1.7

Citations

Study type

Meta-analysis

Sample size

[ not stated in the abstract ]

cerebral cortexcircadian rhythm

Why REM sleep? Clues beyond the laboratory in a more challenging world.

Journal

Biological psychology · 2013

PMID

23174692

RCR

1.6

Citations

Study type

Review

Sample size

[ not stated in the abstract ]

adaptation, physiologicalanimals

The effect of internet-based acceptance and commitment therapy on sleep quality and insomnia in adults: a systematic review and meta-analysis.

Journal

Scientific reports · 2026

PMID

42248986

Citations

Study type

Meta-analysis

Sample size

[ not stated in the abstract ]

humanssleep initiation and maintenance disorders

Association of sleep duration and hypertension in older adults: a cross-sectional study.

Journal

Blood pressure · 2026

PMID

42593006

Citations

Study type

Primary study

Sample size

[ not stated in the abstract ]

humansfemale

Presleep Whey but Not Casein Protein Ingestion Improves Sleep Quality After Resistance Exercise When Compared With an Isocaloric Control in Resistance Trained Individuals.

Journal

International journal of sport nutrition and exercise metabolism · 2026

PMID

42413910

Citations

Study type

Randomized controlled trial

Sample size

[ not stated in the abstract ]

humanswhey proteins

Explanatory Variables of Objectively Measured 24 h Movement Behaviors in Coronary Heart Disease Patients: A Systematic Review.

Journal

Clinical cardiology · 2026

PMID

42605982

Citations

Study type

Systematic review

Sample size

[ not stated in the abstract ]

humanscoronary disease

Macro and micro sleep architecture and cognitive performance in older adults.

Journal

Nature human behaviour · 2021

PMID

33199858

RCR

11.5

Citations

141

Study type

Primary study

Sample size

[ not stated in the abstract ]

age factorsaged

Association of rapid eye movement sleep latency with multimodal biomarkers of Alzheimer's disease.

Journal

Alzheimer's & dementia : the journal of the Alzheimer's Association · 2025

PMID

39868572

RCR

8.6

Citations

Study type

Primary study

Sample size

[ not stated in the abstract ]

humansalzheimer disease

Associations between slow-wave sleep and dementia: a systematic review.

Journal

East Asian archives of psychiatry : official journal of the Hong Kong College of Psychiatrists = Dong Ya jing shen ke xue zhi : Xianggang jing shen ke yi xue yuan qi kan · 2025

PMID

41022659

Citations

Study type

Systematic review

Sample size

[ not stated in the abstract ]

humansdementia

Reduced Slow-Wave Sleep and Sleep-Disordered Breathing Are Linked to Suicidal Ideation in Major Depressive Disorder.

Journal

Brain and behavior · 2026

PMID

42608943

Citations

Study type

Primary study

Sample size

[ not stated in the abstract ]

humansmajor depressive disorder

Appetite adipokines and insulin resistance shape the link between sleep quality and cardiac structure in youths with cardiometabolic risk: the BCAMS study.

Journal

Cytokine · 2025

PMID

40682935

Citations

Study type

Primary study

Sample size

[ not stated in the abstract ]

humansinsulin resistance

Polysomnographic Characteristics of Sleep Architecture in Children With Obstructive Sleep Apnea.

Journal

The Annals of otology, rhinology, and laryngology · 2024

PMID

38450648

RCR

3.2

Citations

Study type

Primary study

Sample size

[ not stated in the abstract ]

humanssleep apnea, obstructive

Vitamin D and sleep in children.

Journal

Journal of clinical sleep medicine : JCSM : official publication of the American Academy of Sleep Medicine · 2021

PMID

32672533

RCR

2.6

Citations

Study type

Primary study

Sample size

[ not stated in the abstract ]

adultchild

Sleep architecture and factors associated with sleep bruxism diagnosis scored by polysomnography recordings: A case-control study.

Journal

Archives of oral biology · 2020

PMID

32097767

RCR

3.0

Citations

Study type

Primary study

Sample size

[ not stated in the abstract ]

adultalcohol drinking

Aging and changes in phasic events during sleep.

Journal

Physiology & behavior · 1994

PMID

8248360

RCR

1.5

Citations

Study type

Review

Sample size

[ not stated in the abstract ]

agedaging

Heritability of sleep architecture based on home polysomnography.

Journal

Journal of sleep research · 2025

PMID

40599001

Citations

Study type

Primary study

Sample size

[ not stated in the abstract ]

humanspolysomnography

Slow-wave sleep loss and cardiometabolic dysfunction: androgenic hormone secretion as a critical intermediate mediator.

Journal

Sleep medicine · 2021

PMID

31812924

RCR

0.6

Citations

Sample size

[ not stated in the abstract ]

androgensfemale

Defining slow wave sleep without slow waves.

Journal

Trends in neurosciences · 2024

PMID

39327160

RCR

0.0

Citations

Study type

Primary study

Sample size

[ not stated in the abstract ]

animalshumans

Sleep Characteristics and Long-Term Risk of Type 2 Diabetes Among Women With Gestational Diabetes.

Journal

JAMA network open · 2025

PMID

40042841

RCR

3.5

Citations

Study type

Primary study

Sample size

[ not stated in the abstract ]

humansfemale

The effect of sleep status on all-cause mortality and premature death among middle-aged and older adults: A national cohort study.

Journal

Archives of gerontology and geriatrics · 2026

PMID

42648048

Citations

Study type

Primary study

Sample size

[ not stated in the abstract ]

humansmortality, premature

Short Sleep Duration Is Positively Associated With Traditional and Non-Traditional Markers of Adiposity and Cardiometabolic Risk in Individuals at Secondary Healthcare: A Cross-Sectional Study.

Journal

FASEB journal : official publication of the Federation of American Societies for Experimental Biology · 2026

PMID

42663994

Citations

Study type

Primary study

Sample size

[ not stated in the abstract ]

humansfemale

Null-Result Studies1

Associations of sleep duration and quality with risk of incident obesity, diabetes, and metabolic syndrome: Results from the Midlife in the United States study.

Journal

Chronobiology international · 2025

PMID

40928139

Citations

Study type

Primary study

Sample size

n = 381

Bears on

Secondary point

humansmetabolic syndrome

Retired / Excluded1

Noribogaine acute administration in rats promotes wakefulness and suppresses REM sleep.

Journal

Psychopharmacology · 2024

PMID

38467891

RCR

0.3

Citations

Study type

Primary study

Sample size

[ not stated in the abstract ]

animalssleep, rem

Evidence for: Consumer wearable sleep trackers measure sleep accurately enough to be meaningful for everyday users.

27 scored

Anchor Studies8

Performance of consumer wrist-worn sleep tracking devices compared to polysomnography: a meta-analysis.

Journal

Journal of clinical sleep medicine : JCSM : official publication of the American Academy of Sleep Medicine · 2025

PMID

39484805

RCR

6.3

Citations

Study type

Meta-analysis

Sample size

[ not stated in the abstract ]

humanspolysomnography

Accuracy of Wristband Fitbit Models in Assessing Sleep: Systematic Review and Meta-Analysis.

Journal

Journal of medical Internet research · 2020

PMID

31778122

RCR

22.8

Citations

330

Study type

Meta-analysis

Sample size

[ not stated in the abstract ]

actigraphyfemale

Accuracy of Fitbit Charge 4, Garmin Vivosmart 4, and WHOOP Versus Polysomnography: Systematic Review.

Journal

JMIR mHealth and uHealth · 2024

PMID

38557808

RCR

16.8

Citations

Study type

Systematic review

Sample size

[ not stated in the abstract ]

humanspolysomnography

Keeping Pace with Wearables: A Living Umbrella Review of Systematic Reviews Evaluating the Accuracy of Consumer Wearable Technologies in Health Measurement.

Journal

Sports medicine (Auckland, N.Z.) · 2024

PMID

39080098

RCR

13.6

Citations

Study type

Systematic review

Sample size

n = 249

humansexercise

Real-World Use of Consumer Sleep Devices: A Rapid Review.

Journal

Chest · 2026

PMID

41811282

Citations

Study type

Review

Sample size

[ not stated in the abstract ]

humanspolysomnography

Validity and reliability of the Oura Ring Generation 3 (Gen3) with Oura sleep staging algorithm 2.0 (OSSA 2.0) when compared to multi-night ambulatory polysomnography: A validation study of 96 participants and 421,045 epochs.

Journal

Sleep medicine · 2024

PMID

38382312

RCR

17.4

Citations

Study type

Primary study

Sample size

[ not stated in the abstract ]

malehumans

Accuracy of Three Commercial Wearable Devices for Sleep Tracking in Healthy Adults.

Journal

Sensors (Basel, Switzerland) · 2024

PMID

39460013

RCR

12.4

Citations

Study type

Primary study

Sample size

[ not stated in the abstract ]

humansadult

Accuracy of 11 Wearable, Nearable, and Airable Consumer Sleep Trackers: Prospective Multicenter Validation Study.

Journal

JMIR mHealth and uHealth · 2023

PMID

37917155

RCR

13.9

Citations

Study type

Primary study

Sample size

75 participants

humansfemale

Supporting Studies17

Sleep assessment using EEG-based wearables - A systematic review.

Journal

Sleep medicine reviews · 2024

PMID

38754209

RCR

17.3

Citations

Study type

Systematic review

Sample size

[ not stated in the abstract ]

humanselectroencephalography

Performance of wearable finger ring trackers for diagnostic sleep measurement in the clinical context.

Journal

Scientific reports · 2025

PMID

40108409

RCR

2.1

Citations

Study type

Primary study

Sample size

[ not stated in the abstract ]

humanspolysomnography

Validation of nocturnal resting heart rate and heart rate variability in consumer wearables.

Journal

Physiological reports · 2025

PMID

40834291

RCR

3.5

Citations

Study type

Validity study

Sample size

[ not stated in the abstract ]

humansheart rate

Deconstructing Commercial Wearable Technology: Contributions toward Accurate and Free-Living Monitoring of Sleep.

Journal

Sensors (Basel, Switzerland) · 2021

PMID

34372308

RCR

2.6

Citations

Study type

Review

Sample size

[ not stated in the abstract ]

photoplethysmographypolysomnography

PSG Validation of minute-to-minute scoring for sleep and wake periods in a consumer wearable device.

Journal

PloS one · 2020

PMID

32941498

RCR

2.4

Citations

Study type

Primary study

Sample size

[ not stated in the abstract ]

accelerometryactigraphy

Improving Sleep Quality Assessment Using Wearable Sensors by Including Information From Postural/Sleep Position Changes and Body Acceleration: A Comparison of Chest-Worn Sensors, Wrist Actigraphy, and Polysomnography.

Journal

Journal of clinical sleep medicine : JCSM : official publication of the American Academy of Sleep Medicine · 2018

PMID

28992827

RCR

2.4

Citations

Study type

Primary study

Sample size

21 participants

actigraphyfemale

A systematic review of the performance of actigraphy in measuring sleep stages.

Journal

Journal of sleep research · 2024

PMID

38384163

RCR

8.3

Citations

Study type

Systematic review

Sample size

[ not stated in the abstract ]

humansactigraphy

Performance evaluation of an under-mattress sleep sensor versus polysomnography in > 400 nights with healthy and unhealthy sleep.

Journal

Journal of sleep research · 2025

PMID

40017337

RCR

7.2

Citations

Study type

Primary study

Sample size

[ not stated in the abstract ]

humanspolysomnography

Validation of Zulu Watch against Polysomnography and Actigraphy for On-Wrist Sleep-Wake Determination and Sleep-Depth Estimation.

Journal

Sensors (Basel, Switzerland) · 2021

PMID

33375557

RCR

1.7

Citations

Study type

Primary study

Sample size

[ not stated in the abstract ]

actigraphyhumans

The Combination of Topological Data Analysis and Mathematical Modeling Improves Sleep Stage Prediction From Consumer-Grade Wearables.

Journal

Journal of biological rhythms · 2024

PMID

39552521

RCR

1.6

Citations

Study type

Primary study

Sample size

[ not stated in the abstract ]

humanswearable electronic devices

Overnight Sleep Staging Using Chest-Worn Accelerometry.

Journal

Sensors (Basel, Switzerland) · 2024

PMID

39275628

RCR

1.9

Citations

Study type

Primary study

Sample size

323 participants

humansmiddle aged

Domain Adversarial Convolutional Neural Network Improves the Accuracy and Generalizability of Wearable Sleep Assessment Technology.

Journal

Sensors (Basel, Switzerland) · 2025

PMID

39771718

RCR

0.4

Citations

Study type

Primary study

Sample size

[ not stated in the abstract ]

humanswearable electronic devices

A Comprehensive Review of Home Sleep Monitoring Technologies: Smartphone Apps, Smartwatches, and Smart Mattresses.

Journal

Sensors (Basel, Switzerland) · 2025

PMID

40292882

RCR

3.6

Citations

Study type

Review

Sample size

[ not stated in the abstract ]

humanssleep

Evaluation of a Contactless Sleep Monitoring Device for Sleep Stage Detection at Home in a Healthy Population: Prospective Study in Free-Living Conditions.

Journal

JMIR human factors · 2026

PMID

41926681

Citations

Study type

Primary study

Sample size

69 women

humansfemale

Validity and clinical utility of a wrist-worn device against polysomnography.

Journal

PloS one · 2025

PMID

41026691

Citations

Study type

Validity study

Sample size

98 participants

humansmale

Evaluating the Feasibility of Low-Cost, Contactless Consumer Sleep-Tracking Devices as Measurement Tools for Preliminary Sleep Research.

Journal

Sensors (Basel, Switzerland) · 2026

PMID

42076480

Citations

Study type

Primary study

Sample size

[ not stated in the abstract ]

humanspolysomnography

Processed EEG in natural sleep.

Journal

Best practice & research. Clinical anaesthesiology · 2006

PMID

16634413

RCR

0.5

Citations

Study type

Review

Sample size

[ not stated in the abstract ]

electroencephalographyhumans

Conflicting Studies2

[title unavailable]

Sample size

[ not stated in the abstract ]

Bears on

Secondary point

Direct application of an ECG-based sleep staging algorithm on reflective photoplethysmography data decreases performance.

Journal

BMC research notes · 2021

PMID

33168051

RCR

1.1

Citations

Study type

Primary study

Sample size

[ not stated in the abstract ]

Bears on

Core claim

algorithmselectrocardiography

Evidence for: Regular and consistent sleep timing is associated with better health outcomes independent of duration.

7 scored

Anchor Studies3

Sleep timing, sleep consistency, and health in adults: a systematic review.

Journal

Applied physiology, nutrition, and metabolism = Physiologie appliquee, nutrition et metabolisme · 2021

PMID

33054339

RCR

18.7

Citations

258

Study type

Systematic review

Sample size

[ not stated in the abstract ]

accidentsadiposity

Sleep regularity as an important component of sleep hygiene: a systematic review.

Journal

Sleep medicine reviews · 2025

PMID

41259946

RCR

3.1

Citations

Study type

Systematic review

Sample size

[ not stated in the abstract ]

humanssleep hygiene

Associations between sleep variability and cardiometabolic health: A systematic review.

Journal

Sleep medicine reviews · 2022

PMID

36081237

RCR

5.6

Citations

Study type

Systematic review

Sample size

[ not stated in the abstract ]

humanshemoglobins

Supporting Studies4

Children's sleep and health: A meta-review.

Journal

Sleep medicine reviews · 2020

PMID

31121414

RCR

24.0

Citations

339

Study type

Systematic review

Sample size

[ not stated in the abstract ]

adipositychild

Association of weekend catch-up sleep, sleep durations and cardiometabolic multimorbidity: Based on NHANES.

Journal

Journal of cardiology · 2025

PMID

40518072

Citations

Study type

Primary study

Sample size

[ not stated in the abstract ]

humansmale

Can weekend catch-up sleep repay the sleep debt? Balancing short-term relief with long-term risks.

Journal

Sleep & breathing = Schlaf & Atmung · 2025

PMID

41148489

Citations

Study type

Review

Sample size

[ not stated in the abstract ]

humanssleep deprivation

Acute sleep rebound following sleep restriction is associated with reduced mortality risk.

Journal

Nature communications · 2026

PMID

42045198

Citations

Study type

Primary study

Sample size

[ not stated in the abstract ]

humanssleep deprivation

01On Our Desk

In Progress

What we're reading right now

A study only enters a claim's evidence once it's read in full and weighed against what's already in file.

Identified

Queued

Under Review

Extracted

Pending Consensus

Association between stage-specific sleep bout durations and obstructive sleep apnea severity: A variable-domain functional regression approach

Identified

medRxiv · 2026·Functional-regression analysis linking stage-specific sleep bout duration patterns to obstructive sleep apnea severity; relevant to how fine-grained sleep architecture relates to sleep-disordered breathing outcomes, worth tracking for eventual bearing on the duration/health claim.

PreprintNot peer reviewed. Does not influence any evidence rating until critically evaluated.

Consecutive day effects between sleep quality and affective symptoms among youth in the Brazilian High-Risk Cohort study

Identified

medRxiv · 2026·Day-level EMA cohort study testing consecutive-day bidirectional associations between sleep quality and affective symptoms in youth; relevant to the sleep-quality-and-health-outcomes proposition once peer-reviewed.

PreprintNot peer reviewed. Does not influence any evidence rating until critically evaluated.

Collapse of local circuit integrated information {Phi} during NREM sleep

Identified

bioRxiv · 2026·Preprint modeling collapse of integrated information during NREM sleep, relevant to mechanistic understanding of sleep and consciousness that could eventually bear on the duration/health or cognition angle once peer-reviewed.

PreprintNot peer reviewed. Does not influence any evidence rating until critically evaluated.

Sex differences in sleep regularity and its associations with mortality

Identified

medRxiv · 2026·Large-scale analysis of sex differences in sleep regularity and mortality, directly relevant to the regularity_health claim once peer-reviewed.

PreprintNot peer reviewed. Does not influence any evidence rating until critically evaluated.

Digital Behavioural Therapy for Insomnia and its Effects on Depression and Anxiety: An Individual Participant Data Meta-Analysis

Identified

medRxiv · 2026·Individual participant data meta-analysis of digital CBT-I/sleep restriction therapy effects on depression and anxiety, relevant to the duration_health claim's intervention side once peer-reviewed.

PreprintNot peer reviewed. Does not influence any evidence rating until critically evaluated.

Longitudinal Sleep-Health Phenotypes Identified by Hierarchical Clustering in the Sleep Heart Health Study

Identified

medRxiv · 2026·Longitudinal clustering of sleep-health phenotypes in the Sleep Heart Health Study, potentially relevant to how multidimensional sleep metrics relate to health outcomes.

PreprintNot peer reviewed. Does not influence any evidence rating until critically evaluated.

Associations of polygenic scores for sleep traits with cognitive function

Identified

medRxiv · 2026·Multi-cohort polygenic score analysis linking sleep trait genetics to cognitive function, relevant to the duration_health claim's cognitive domain once peer-reviewed.

PreprintNot peer reviewed. Does not influence any evidence rating until critically evaluated.

Wearable sleep staging performance declines with sleep apnea severity and is sensitive to training-set composition in very severe sleep apnea

Identified

medRxiv · 2026·Directly on-topic for wearable_accuracy: reports wearable sleep staging performance declining with sleep apnea severity and sensitivity to training-set composition, a real accuracy-limiting finding worth evaluating once peer-reviewed.

PreprintNot peer reviewed. Does not influence any evidence rating until critically evaluated.

02Research Log

JUL 9 2026

doi:10.1016/j.diabres.2026.113387 entered as supporting on the duration_health claim.

doi:10.1016/j.neuron.2023.03.005 entered as supporting on the duration_health claim.

doi:10.1016/j.numecd.2024.10.020 entered as supporting on the duration_health claim.

doi:10.1016/j.pcad.2023.02.005 entered as supporting on the duration_health claim.

doi:10.1016/j.smrv.2018.01.008 entered as supporting on the duration_health claim.

doi:10.1016/j.smrv.2023.101764 entered as supporting on the duration_health claim.

doi:10.1016/j.smrv.2026.102284 entered as supporting on the duration_health claim.

doi:10.1016/s0140-6736(99)01376-8 entered as anchor on the duration_health claim.

doi:10.1038/s41467-025-58271-x entered as supporting on the duration_health claim.

doi:10.1038/s41598-025-93774-z entered as supporting on the duration_health claim.

doi:10.1038/s42003-021-02825-4 entered as anchor on the duration_health claim.

doi:10.1038/s42003-025-07868-5 entered as supporting on the duration_health claim.

doi:10.1038/srep35812 entered as supporting on the duration_health claim.

doi:10.1080/07420528.2025.2556840 entered as null_result on the duration_health claim.

doi:10.1080/14017431.2025.2550279 entered as supporting on the duration_health claim.

doi:10.1089/met.2025.0033 entered as supporting on the duration_health claim.

doi:10.1093/brain/awaf453 entered as supporting on the duration_health claim.

doi:10.1093/sleep/26.2.117 entered as anchor on the duration_health claim.

doi:10.1093/sleep/32.3.311 entered as supporting on the duration_health claim.

doi:10.1093/sleep/zsab051 entered as supporting on the duration_health claim.

doi:10.1113/jp284911 entered as supporting on the duration_health claim.

doi:10.1126/science.aad2993 entered as supporting on the duration_health claim.

doi:10.1139/apnm-2020-0034 entered as anchor on the duration_health claim.

doi:10.1161/atvbaha.125.322869 entered as supporting on the duration_health claim.

doi:10.1161/cir.0000000000000444 entered as anchor on the duration_health claim.

doi:10.1161/hcq.0000000000000139 entered as anchor on the duration_health claim.

doi:10.1249/jsr.0000000000000418 entered as supporting on the duration_health claim.

doi:10.5664/jcsm.11460 entered as supporting on the duration_health claim.

doi:10.1007/s11325-025-03473-2 entered as supporting on the regularity_health claim.

doi:10.1016/j.jjcc.2025.06.005 entered as supporting on the regularity_health claim.

doi:10.1016/j.smrv.2019.04.011 entered as supporting on the regularity_health claim.

doi:10.1016/j.smrv.2022.101688 entered as anchor on the regularity_health claim.

doi:10.1016/j.smrv.2025.102203 entered as anchor on the regularity_health claim.

doi:10.1038/s41467-026-72461-1 entered as supporting on the regularity_health claim.

doi:10.1139/apnm-2020-0032 entered as anchor on the regularity_health claim.

doi:10.1007/s40279-024-02077-2 entered as anchor on the wearable_accuracy claim.

doi:10.1016/j.chest.2025.10.039 entered as anchor on the wearable_accuracy claim.

doi:10.1016/j.sleep.2024.01.020 entered as anchor on the wearable_accuracy claim.

doi:10.1016/j.smrv.2024.101951 entered as supporting on the wearable_accuracy claim.

doi:10.1038/s41598-025-93774-z entered as supporting on the wearable_accuracy claim.

doi:10.1111/jsr.14143 entered as supporting on the wearable_accuracy claim.

doi:10.1111/jsr.14480 entered as supporting on the wearable_accuracy claim.

doi:10.1177/07487304241288607 entered as supporting on the wearable_accuracy claim.

doi:10.1371/journal.pone.0238464 entered as supporting on the wearable_accuracy claim.

doi:10.1371/journal.pone.0330774 entered as supporting on the wearable_accuracy claim.

doi:10.14814/phy2.70527 entered as supporting on the wearable_accuracy claim.

doi:10.2196/16273 entered as anchor on the wearable_accuracy claim.

doi:10.2196/50983 entered as anchor on the wearable_accuracy claim.

doi:10.2196/52192 entered as anchor on the wearable_accuracy claim.

doi:10.2196/77033 entered as supporting on the wearable_accuracy claim.

doi:10.3390/s21010076 entered as supporting on the wearable_accuracy claim.

doi:10.3390/s21155071 entered as supporting on the wearable_accuracy claim.

doi:10.3390/s24175717 entered as supporting on the wearable_accuracy claim.

doi:10.3390/s24206532 entered as anchor on the wearable_accuracy claim.

doi:10.3390/s24247982 entered as supporting on the wearable_accuracy claim.

doi:10.3390/s25061771 entered as supporting on the wearable_accuracy claim.

doi:10.3390/s26082371 entered as supporting on the wearable_accuracy claim.

doi:10.5664/jcsm.11460 entered as anchor on the wearable_accuracy claim.

doi:10.5664/jcsm.6802 entered as supporting on the wearable_accuracy claim.

JUL 9 2026

doi:10.1080/07420528.2025.2556840 entered as a null result study on the duration_health claim, flagged as bearing on a secondary point, not the core direction.

Because it does not hit the core claim, it does not cap the rating and is tracked as an open question.

JUL 17 2026

pmid:41399178 entered as conflicting on the wearable_accuracy claim.

JUL 17 2026

pmid:41399178 entered as a conflicting study on the wearable_accuracy claim, flagged as bearing on a secondary point, not the core direction.

Because it does not hit the core claim, it does not cap the rating and is tracked as an open question.

AUG 7 2026

doi:10.1093/sleep/zsaa296 entered as supporting on the duration_health claim.

doi:10.1093/sleep/zsx165 entered as supporting on the duration_health claim.

doi:10.1016/j.bpa.2005.08.006 entered as supporting on the wearable_accuracy claim.

AUG 14 2026

doi:10.1007/s00213-024-06572-2 entered as retired on the duration_health claim.

doi:10.1016/0006-3223(92)90058-8 entered as supporting on the duration_health claim.

doi:10.1016/j.biopsycho.2012.10.010 entered as supporting on the duration_health claim.

AUG 21 2026

doi:10.1002/alz.14495 entered as supporting on the duration_health claim.

doi:10.1002/brb3.71693 entered as supporting on the duration_health claim.

doi:10.1002/clc.70440 entered as supporting on the duration_health claim.

doi:10.1016/0031-9384(93)90095-w entered as supporting on the duration_health claim.

doi:10.1016/j.archoralbio.2020.104685 entered as supporting on the duration_health claim.

doi:10.1016/j.cyto.2025.156998 entered as supporting on the duration_health claim.

doi:10.1016/j.sleep.2019.08.012 entered as supporting on the duration_health claim.

doi:10.1016/j.tins.2024.09.002 entered as supporting on the duration_health claim.

doi:10.1038/s41562-020-00964-y entered as supporting on the duration_health claim.

doi:10.1038/s41598-026-56513-6 entered as supporting on the duration_health claim.

doi:10.1080/08037051.2026.2717792 entered as supporting on the duration_health claim.

doi:10.1111/jsr.14448 entered as supporting on the duration_health claim.

doi:10.1123/ijsnem.2025-0205 entered as supporting on the duration_health claim.

doi:10.1177/00034894241232477 entered as supporting on the duration_health claim.

doi:10.12809/eaap2577 entered as supporting on the duration_health claim.

doi:10.5664/jcsm.8440 entered as supporting on the duration_health claim.

SEP 4 2026

doi:10.1001/jamanetworkopen.2025.0142 entered as supporting on the duration_health claim.

doi:10.1016/j.archger.2026.106385 entered as supporting on the duration_health claim.

doi:10.1096/fj.202602078rr entered as supporting on the duration_health claim.

doi:10.1186/s13104-020-05355-0 entered as conflicting on the wearable_accuracy claim.

doi:10.3390/s21010076 entered as supporting on the wearable_accuracy claim.

SEP 4 2026

doi:10.1186/s13104-020-05355-0 entered as a conflicting study on the wearable_accuracy claim, bearing on the core claim.

It caps the rating until reconciled.

04Revision Log

SEP 4 2026

wearable_accuracy: Established → Emerging

Moved to Emerging by rule from the current evidence for: Consumer wearables measure sleep parameters with acceptable agreement against polysomnography..

JUL 9 2026

regularity_health: opened at Established

Opened at Established by rule from the current evidence for: Greater sleep-timing irregularity is associated with worse health outcomes..

JUL 9 2026

wearable_accuracy: opened at Established

Opened at Established by rule from the current evidence for: Consumer wearables measure sleep parameters with acceptable agreement against polysomnography..

JUL 9 2026

duration_health: opened at Established

Opened at Established by rule from the current evidence for: Insufficient sleep duration is associated with worse health outcomes..

This page interprets published research. It is not medical advice. The KnowYourPrime Research Desk rates the evidence supporting a claim, not the claim itself. It does not diagnose or treat. Talk to your own doctor about your health.