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Sleep

Sleep quality and duration effects on cognition, mood, and physical performance.

Research synthesis3 min read

What the Sleep Research Actually Shows

Hundreds of sleep studies agree on a short list of high-leverage interventions. Here's what the evidence actually supports — and what it doesn't.

The Problem with Sleep Advice

Most sleep advice is one of two things: obvious (go to bed at the same time every night) or unfounded (take this supplement, follow this routine). The research literature is more useful and more specific than either.

After reviewing the peer-reviewed evidence, a few findings stand out for their consistency across study designs, populations, and effect sizes.

What the Evidence Consistently Supports

Consistent sleep and wake timing is the strongest single intervention. Across dozens of controlled studies, irregular sleep timing — not just short sleep — predicts worse mood, cognition, and metabolic markers. The circadian rhythm is not forgiving. One night of a shifted schedule measurably degrades next-day performance even when total sleep hours are held constant.

Light exposure drives circadian alignment. Morning bright light (1000+ lux, ideally outdoors) advances the circadian phase and makes falling asleep at your target time easier. Evening blue light does the reverse. The effect sizes here are large — 30 minutes of morning outdoor light shows measurable effects on sleep onset in controlled trials.

Core body temperature predicts sleep onset. Sleep begins as core temperature drops. A warm bath or shower 1–2 hours before bed accelerates this drop via peripheral vasodilation, consistently reducing sleep onset latency in RCTs. Cold bedroom temperatures (16–19°C) have a similar effect.

Caffeine's half-life is longer than most people assume. It's approximately 5–6 hours in most adults, but with significant individual variation based on CYP1A2 genotype. A 200mg dose at 2pm leaves roughly 100mg active at 8pm. Studies measuring sleep architecture (not just subjective quality) show that late caffeine reduces slow-wave sleep even when subjects report sleeping fine.

What the Evidence Is Weaker On

Sleep tracking accuracy varies significantly by device. Wrist-based actigraphy tends to overestimate sleep and underestimate wake, especially in poor sleepers. Subjective sleep quality ratings often diverge from objective measures — which makes self-experimentation particularly valuable here.

Supplements show mixed results. Melatonin has strong evidence for circadian phase-shifting (jet lag, shift work) but weaker evidence as a general sleep quality enhancer in people without circadian disruption. Magnesium glycinate shows some signal but the effect sizes in quality RCTs are modest.

"Sleep hygiene" bundles are hard to study cleanly. Most RCTs test multiple interventions together, making it impossible to isolate which component drives the effect.

Why Individual Variation Matters

The population-level averages mask enormous individual differences. Caffeine sensitivity, chronotype, optimal sleep duration, and response to light all vary meaningfully between people. The literature gives you a good prior — it's worth testing whether the high-leverage interventions actually move your personal sleep metrics.

Full article →Test this on yourself →

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eHealth-Based Psychosocial Interventions for Adults With Insomnia: Systematic Review and Meta-analysis of Randomized Controlled Trials.

Online or app-based psychosocial interventions are highly effective at reducing insomnia severity and improving sleep quality, especially if they include guidance from a human therapist, making them a promising and accessible option for self-experimenters.

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Evidence base

Min quality:

50 papers

StudyLeading journalModerate

The two‐process model of sleep regulation: a reappraisal

Alexander A. Borbély, Serge Daan, Anna Wirz‐Justice +1 more · Journal of Sleep Research · 2016 · 1,540 citations

In the last three decades the two-process model of sleep regulation has served as a major conceptual framework in sleep research. It has been applied widely in studies on fatigue and performance and to dissect individual differences in sleep regulation. The model posits that a homeostatic process (Process S) interacts with a process controlled by the circadian pacemaker (Process C), with time-courses derived from physiological and behavioural variables. The model simulates successfully the timing and intensity of sleep in diverse experimental protocols. Electrophysiological recordings from the suprachiasmatic nuclei (SCN) suggest that S and C interact continuously. Oscillators outside the SCN that are linked to energy metabolism are evident in SCN-lesioned arrhythmic animals subjected to restricted feeding or methamphetamine administration, as well as in human subjects during internal desynchronization. In intact animals these peripheral oscillators may dissociate from the central pacemaker rhythm. A sleep/fast and wake/feed phase segregate antagonistic anabolic and catabolic metabolic processes in peripheral tissues. A deficiency of Process S was proposed to account for both depressive sleep disturbances and the antidepressant effect of sleep deprivation. The model supported the development of novel non-pharmacological treatment paradigms in psychiatry, based on manipulating circadian phase, sleep and light exposure. In conclusion, the model remains conceptually useful for promoting the integration of sleep and circadian rhythm research. Sleep appears to have not only a short-term, use-dependent function; it also serves to enforce rest and fasting, thereby supporting the optimization of metabolic processes at the appropriate phase of the 24-h cycle.

StudyLeading journalModerate

Cumulative Sleepiness, Mood Disturbance, and Psychomotor Vigilance Performance Decrements During a Week of Sleep Restricted to 4–5 Hours per Night

David F. Dinges, Frances M. Pack, Katherine Williams +5 more · SLEEP · 1997 · 2,042 citations

To determine whether a cumulative sleep debt (in a range commonly experienced) would result in cumulative changes in measures of waking neurobehavioral alertness, 16 healthy young adults had their sleep restricted 33% below habitual sleep duration, to an average 4.98 hours per night [standard deviation (SD) = 0.57] for seven consecutive nights. Subjects slept in the laboratory, and sleep and waking were monitored by staff and actigraphy. Three times each day (1000, 1600, and 2200 hours) subjects were assessed for subjective sleepiness (SSS) and mood (POMS) and were evaluated on a brief performance battery that included psychomotor vigilance (PVT), probed memory (PRM), and serial-addition testing, Once each day they completed a series of visual analog scales (VAS) and reported sleepiness and somatic and cognitive/emotional problems. Sleep restriction resulted in statistically robust cumulative effects on waking functions. SSS ratings, subscale scores for fatigue, confusion, tension, and total mood disturbance from the POMS and VAS ratings of mental exhaustion and stress were evaluated across days of restricted sleep (p = 0.009 to p = 0.0001). PVT performance parameters, including the frequency and duration of lapses, were also significantly increased by restriction (p = 0.018 to p = 0.0001). Significant time-of-day effects were evident in SSS and PVT data, but time-of-day did not interact with the effects of sleep restriction across days. The temporal profiles of cumulative changes in neurobehavioral measures of alertness as a function of sleep restriction were generally consistent. Subjective changes tended to precede performance changes by 1 day, but overall changes in both classes of measure were greatest during the first 2 days (P1, P2) and last 2 days (P6, P7) of sleep restriction. Data from subsets of subjects also showed: 1) that significant decreases in the MSLT occurred during sleep restriction, 2) that the elevated sleepiness and performance deficits continued beyond day 7 of restriction, and 3) that recovery from these deficits appeared to require two full nights of sleep. The cumulative increase in performance lapses across days of sleep restriction correlated closely with MSLT results (r = -0.95) from an earlier comparable experiment by Carskadon and Dement (1). These findings suggest that cumulative nocturnal sleep debt had a dynamic and escalating analog in cumulative daytime sleepiness and that asymptotic or steady-state sleepiness was not achieved in response to sleep restriction.

StudyLeading journalModerate

The Cumulative Cost of Additional Wakefulness: Dose-Response Effects on Neurobehavioral Functions and Sleep Physiology From Chronic Sleep Restriction and Total Sleep Deprivation

Hans P. A. Van Dongen, Greg Maislin, Janet Mullington +1 more · SLEEP · 2003 · 3,120 citations

OBJECTIVES: To inform the debate over whether human sleep can be chronically reduced without consequences, we conducted a dose-response chronic sleep restriction experiment in which waking neurobehavioral and sleep physiological functions were monitored and compared to those for total sleep deprivation. DESIGN: The chronic sleep restriction experiment involved randomization to one of three sleep doses (4 h, 6 h, or 8 h time in bed per night), which were maintained for 14 consecutive days. The total sleep deprivation experiment involved 3 nights without sleep (0 h time in bed). Each study also involved 3 baseline (pre-deprivation) days and 3 recovery days. SETTING: Both experiments were conducted under standardized laboratory conditions with continuous behavioral, physiological and medical monitoring. PARTICIPANTS: A total of n = 48 healthy adults (ages 21-38) participated in the experiments. INTERVENTIONS: Noctumal sleep periods were restricted to 8 h, 6 h or 4 h per day for 14 days, or to 0 h for 3 days. All other sleep was prohibited. RESULTS: Chronic restriction of sleep periods to 4 h or 6 h per night over 14 consecutive days resulted in significant cumulative, dose-dependent deficits in cognitive performance on all tasks. Subjective sleepiness ratings showed an acute response to sleep restriction but only small further increases on subsequent days, and did not significantly differentiate the 6 h and 4 h conditions. Polysomnographic variables and delta power in the non-REM sleep EEG-a putative marker of sleep homeostasis--displayed an acute response to sleep restriction with negligible further changes across the 14 restricted nights. Comparison of chronic sleep restriction to total sleep deprivation showed that the latter resulted in disproportionately large waking neurobehavioral and sleep delta power responses relative to how much sleep was lost. A statistical model revealed that, regardless of the mode of sleep deprivation, lapses in behavioral alertness were near-linearly related to the cumulative duration of wakefulness in excess of 15.84 h (s.e. 0.73 h). CONCLUSIONS: Since chronic restriction of sleep to 6 h or less per night produced cognitive performance deficits equivalent to up to 2 nights of total sleep deprivation, it appears that even relatively moderate sleep restriction can seriously impair waking neurobehavioral functions in healthy adults. Sleepiness ratings suggest that subjects were largely unaware of these increasing cognitive deficits, which may explain why the impact of chronic sleep restriction on waking cognitive functions is often assumed to be benign. Physiological sleep responses to chronic restriction did not mirror waking neurobehavioral responses, but cumulative wakefulness in excess of a 15.84 h predicted performance lapses across all four experimental conditions. This suggests that sleep debt is perhaps best understood as resulting in additional wakefulness that has a neurobiological "cost" which accumulates over time.

StudyModerate

Effects of light on human circadian rhythms, sleep and mood

Christine Blume, Corrado Garbazza, Manuel Spitschan · Somnologie - Schlafforschung und Schlafmedizin · 2019 · 626 citations

Humans live in a 24-hour environment, in which light and darkness follow a diurnal pattern. Our circadian pacemaker, the suprachiasmatic nuclei (SCN) in the hypothalamus, is entrained to the 24-hour solar day via a pathway from the retina and synchronises our internal biological rhythms. Rhythmic variations in ambient illumination impact behaviours such as rest during sleep and activity during wakefulness as well as their underlying biological processes. Rather recently, the availability of artificial light has substantially changed the light environment, especially during evening and night hours. This may increase the risk of developing circadian rhythm sleep-wake disorders (CRSWD), which are often caused by a misalignment of endogenous circadian rhythms and external light-dark cycles. While the exact relationship between the availability of artificial light and CRSWD remains to be established, nocturnal light has been shown to alter circadian rhythms and sleep in humans. On the other hand, light can also be used as an effective and noninvasive therapeutic option with little to no side effects, to improve sleep,mood and general well-being. This article reviews our current state of knowledge regarding the effects of light on circadian rhythms, sleep, and mood.

ObservationalWikiModerate

Sleep Quality among Medical Students of a Tertiary Care Hospital: A Descriptive Cross-sectional Study

Nabin Sundas, Saransh Ghimire, Suzit Bhusal +3 more · Journal of Nepal Medical Association · 2020 · 49 citations

Nearly half (44.23%) of medical students at one Nepalese hospital reported poor sleep quality, with an average sleep duration of only 6.7 hours per night — below the recommended 7–9 hours for young adults — suggesting that academic stress and lifestyle factors may be systematically disrupting sleep in this population.

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StudyModerate

Add-on prolonged-release melatonin for cognitive function and sleep in mild to moderate Alzheimer’s disease: a 6-month, randomized, placebo-controlled, multicenter trial

Moshe Laudon, Alan Wade, Mildred V. Farmer +5 more · Clinical Interventions in Aging · 2014 · 169 citations

PURPOSE: A link between poor sleep quality and Alzheimer's disease (AD) has recently been suggested. Since endogenous melatonin levels are already reduced at preclinical AD stages, it is important to ask whether replenishing the missing hormone would be beneficial in AD and whether any such effects would be related to the presence of sleep disorder in patients. PATIENTS AND METHODS: The effects of add-on prolonged-release melatonin (PRM) (2 mg) to standard therapy on cognitive functioning and sleep were investigated in 80 patients (men [50.7%], women [49.3%], average age 75.3 years [range, 52-85 years]) diagnosed with mild to moderate AD, with and without insomnia comorbidity, and receiving standard therapy (acetylcholinesterase inhibitors with or without memantine). In this randomized, double-blind, parallel-group study, patients were treated for 2 weeks with placebo and then randomized (1:1) to receive 2 mg of PRM or placebo nightly for 24 weeks, followed by 2 weeks placebo. The AD Assessment Scale-Cognition (ADAS-Cog), Instrumental Activities of Daily Living (IADL), Mini-Mental State Examination (MMSE), sleep, as assessed by the Pittsburgh Sleep Quality Index (PSQI) and a daily sleep diary, and safety parameters were measured. RESULTS: Patients treated with PRM (24 weeks) had significantly better cognitive performance than those treated with placebo, as measured by the IADL (P=0.004) and MMSE (P=0.044). Mean ADAS-Cog did not differ between the groups. Sleep efficiency, as measured by the PSQI, component 4, was also better with PRM (P=0.017). In the comorbid insomnia (PSQI ≥6) subgroup, PRM treatment resulted in significant and clinically meaningful effects versus the placebo, in mean IADL (P=0.032), MMSE score (+1.5 versus -3 points) (P=0.0177), and sleep efficiency (P=0.04). Median ADAS-Cog values (-3.5 versus +3 points) (P=0.045) were significantly better with PRM. Differences were more significant at longer treatment duration. PRM was well tolerated, with an adverse event profile similar to that of placebo. CONCLUSION: Add-on PRM has positive effects on cognitive functioning and sleep maintenance in AD patients compared with placebo, particularly in those with insomnia comorbidity. The results suggest a possible causal link between poor sleep and cognitive decline.

StudyLeading journalModerate

Sleep inertia

Patrícia Tassi, Alain Muzet · Sleep Medicine Reviews · 2000 · 445 citations

StudyLeading journalModerate

Neurobehavioral Dynamics Following Chronic Sleep Restriction: Dose-Response Effects of One Night for Recovery

Siobhan Banks, Hans P. A. Van Dongen, Greg Maislin +1 more · SLEEP · 2010 · 288 citations

OBJECTIVE: Establish the dose-response relationship between increasing sleep durations in a single night and recovery of neurobehavioral functions following chronic sleep restriction. DESIGN: Intent-to-treat design in which subjects were randomized to 1 of 6 recovery sleep doses (0, 2, 4, 6, 8, or 10 h TIB) for 1 night following 5 nights of sleep restriction to 4 h TIB. SETTING: Twelve consecutive days in a controlled laboratory environment. PARTICIPANTS: N = 159 healthy adults (aged 22-45 y), median = 29 y). INTERVENTIONS: Following a week of home monitoring with actigraphy and 2 baseline nights of 10 h TIB, subjects were randomized to either sleep restriction to 4 h TIB per night for 5 nights followed by randomization to 1 of 6 nocturnal acute recovery sleep conditions (N = 142), or to a control condition involving 10 h TIB on all nights (N = 17). MEASUREMENTS AND RESULTS: Primary neurobehavioral outcomes included lapses on the Psychomotor Vigilance Test (PVT), subjective sleepiness from the Karolinska Sleepiness Scale (KSS), and physiological sleepiness from a modified Maintenance of Wakefulness Test (MWT). Secondary outcomes included psychomotor and cognitive speed as measured by PVT fastest RTs and number correct on the Digit Symbol Substitution Task (DSST), respectively, and subjective fatigue from the Profile of Mood States (POMS). The dynamics of neurobehavioral outcomes following acute recovery sleep were statistically modeled across the 0 h-10 h recovery sleep doses. While TST, stage 2, REM sleep and NREM slow wave energy (SWE) increased linearly across recovery sleep doses, best-fitting neurobehavioral recovery functions were exponential across recovery sleep doses for PVT and KSS outcomes, and linear for the MWT. Analyses based on return to baseline and on estimated intersection with control condition means revealed recovery was incomplete at the 10 h TIB (8.96 h TST) for PVT performance, KSS sleepiness, and POMS fatigue. Both TST and SWE were elevated above baseline at the maximum recovery dose of 10 h TIB. CONCLUSIONS: Neurobehavioral deficits induced by 5 nights of sleep restricted to 4 h improved monotonically as acute recovery sleep dose increased, but some deficits remained after 10 h TIB for recovery. Complete recovery from such sleep restriction may require a longer sleep period during 1 night, and/or multiple nights of recovery sleep. It appears that acute recovery from chronic sleep restriction occurs as a result of elevated sleep pressure evident in both increased SWE and TST.

StudyModerate

Lack of sleep as a contributor to obesity in adolescents: impacts on eating and activity behaviors

Jean‐Philippe Chaput, Caroline Dutil · International Journal of Behavioral Nutrition and Physical Activity · 2016 · 241 citations

BACKGROUND: Sleep is an important contributor to physical and mental health; however, chronic sleep deprivation has become common in adolescents, especially on weekdays. Adolescents aged 14-17 years are recommended to sleep between 8 and 10 h per night to maximize overall health and well-being. Although sleep needs may vary between individuals, sleep duration recommendations are important for surveillance and help inform policies, interventions, and the population of healthy sleep behaviors. Long sleepers are very rare among teenagers and sleeping too much is not a problem per se; only insufficient sleep is associated with adverse health outcomes in the pediatric population. Causes of insufficient sleep are numerous and chronic sleep deprivation poses a serious threat to the academic success, health and safety of adolescents. This article focuses on the link between insufficient sleep and obesity in adolescents. DISCUSSION: This "call to action" article argues that sleep should be taken more seriously by the public health community and by our society in general, i.e., given as much attention and resources as nutrition and physical activity. Not only that having a good night's sleep is as important as eating a healthy diet and being regularly physically active for overall health, but sleeping habits also impact eating and screen time behaviors and, therefore, can influence body weight control. Short sleep duration, poor sleep quality, and late bedtimes are all associated with excess food intake, poor diet quality, and obesity in adolescents. Sleep, sedentary behavior, physical activity and diet all interact and influence each other to ultimately impact health. A holistic approach to health (i.e., the whole day matters) targeting all of these behaviors synergistically is needed to optimize the impact of our interventions. Sleep is not a waste of time and sleep hygiene is an important factor to consider in the prevention and treatment of obesity.

StudyLeading journalModerate

The Impact of Moderate Sleep Loss on Neurophysiologic Signals during Working-Memory Task Performance

Michael E. Smith, Linda K. McEvoy, Alan Gevins · SLEEP · 2002 · 212 citations

STUDY OBJECTIVES: This study examined how sleep loss affects neurophysiologic signals related to attention and working memory. DESIGN: Subjective sleepiness, resting-state electroencephalogram, and behavior and electroencephalogram during performance of working-memory tasks were recorded in a within-subject, repeated-measures design. SETTING: Data collection occurred in a computerized laboratory setting. PARTICIPANTS: Sixteen healthy adults (mean age, 26 years; 8 female) INTERVENTIONS: Data from alert daytime baseline tests were compared with data from tests during a late-night, extended-wakefulness session that spanned up to 21 hours of sleep deprivation. MEASUREMENTS AND RESULTS: Alertness measured both subjectively and electrophysiologically decreased monotonically with increasing sleep deprivation. A lack of alertness-related changes in electroencephalographic measures of the overall mental effort exerted during task execution indicated that participants attempted to maintain high levels of performance throughout the late-night tests. Despite such continued effort, responses became slower, more variable, and more error prone within 1 hour after participants' normal time of sleep onset. This behavior failure was accompanied by significant degradation of event-related brain potentials related to the transient focusing of attention. CONCLUSIONS: Moderate sleep loss compromises the function of neural circuits critical to subsecond attention allocation during working-memory tasks, even when an effort is made to maintain wakefulness and performance. Multivariate analyses indicate that combinations of working-memory-related behavior and neurophysiologic measures can be sensitive enough to permit reliable detection of such effects of sleep loss in individuals. Similar methods might prove useful for assessment of functional alertness in patients with sleep disorders.

StudyTop journalModerate

Spatial transcriptomics reveals unique gene expression changes in different brain regions after sleep deprivation

Yann Vanrobaeys, Zeru Peterson, Emily N. Walsh +5 more · Nature Communications · 2023 · 56 citations

Sleep deprivation has far-reaching consequences on the brain and behavior, impacting memory, attention, and metabolism. Previous research has focused on gene expression changes in individual brain regions, such as the hippocampus or cortex. Therefore, it is unclear how uniformly or heterogeneously sleep loss affects the brain. Here, we use spatial transcriptomics to define the impact of a brief period of sleep deprivation across the brain in male mice. We find that sleep deprivation induced pronounced differences in gene expression across the brain, with the greatest changes in the hippocampus, neocortex, hypothalamus, and thalamus. Both the differentially expressed genes and the direction of regulation differed markedly across regions. Importantly, we developed bioinformatic tools to register tissue sections and gene expression data into a common anatomical space, allowing a brain-wide comparison of gene expression patterns between samples. Our results suggest that distinct molecular mechanisms acting in discrete brain regions underlie the biological effects of sleep deprivation.

BookHigh evidence score

Why We Sleep

Matthew P. Walker, Matthew Walker · Simon & Schuster Audio and Blackstone Audio · 2017 · ★ 4.5 (20)

BookWikiHigh evidence score

Why We Sleep: The New Science of Sleep and Dreams

Matthew Walker · Allan Lane · 2018

Chronic sleep restriction (less than 7 hours per night) impairs cognitive performance by 20–40%, increases risk of Alzheimer's disease by up to 33% per decade of poor sleep, and elevates all-cause mortality by 12–15% — but these effects are reversible with consistent 7–9 hour sleep schedules.

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BookHigh evidence score

The circadian code

Satchin Panda · Rodale Books · 2018 · ★ 4.0 (1)

RCTWikiHigh evidence score

Melatonin for Sleep Quality and Occupational Cognitive Performance in Shift Workers with Low Sleep Quality: A Randomized, Double‐Blind, Placebo‐Controlled Clinical Trial

Sajad Khanjani, Ahmad Shamabadi, Shahin Akhondzadeh +1 more · Journal of Clinical Pharmacy and Therapeutics · 2024 · 4 citations

Taking 5 mg of melatonin before sleep for 4 weeks improved subjective sleep quality within a week and occupational cognitive performance within a month for shift workers experiencing sleep problems, suggesting it's a promising intervention for self-experimenters in similar situations.

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StudyTop journalModerate

Posttraining Sleep Enhances Automaticity in Perceptual Discrimination

Mercedes Atienza, José L. Cantero, Robert Stickgold · Journal of Cognitive Neuroscience · 2004 · 152 citations

Perceptual learning can develop over extended periods, with slow, at times sleep-dependent, improvement seen several days after training. As a result, performance can become more automatic, that is, less dependent on voluntary attention. This study investigates whether the brain correlates of this enhancement of automaticity are sleep-dependent. Event-related potentials produced in response to complex auditory stimuli were recorded while subjects' attention was focused elsewhere. We report here that following training on an auditory discrimination task, performance continued to improve, without significant further training, for 72 hr. At the same time, several event-related potential components became evident 48-72 hr after training. Posttraining sleep deprivation prevented neither the continued performance improvement nor the slow development of cortical dynamics related to an enhanced familiarity with the task. However, those brain responses associated with the automatic shift of attention to unexpected stimuli failed to develop. Thus, in this auditory learning paradigm, posttraining sleep appears to reduce the voluntary attentional effort required for successful perceptual discrimination by facilitating the intrusion of a potentially meaningful stimulus into one's focus of attention for further evaluation.

Meta-analysisLeading journalWikiHigh evidence score

Sleep quality in eating disorders: A systematic review and meta-analysis.

Degasperi G, Meneo D, Curati S +3 more · Sleep Med Rev · 2024 · 35 citations

This meta-analysis found that individuals with eating disorders (EDs) generally experience poorer subjective and physiological sleep quality compared to healthy individuals, with Anorexia Nervosa patients showing particularly impaired physiological sleep, suggesting that addressing sleep could be a valuable part of managing EDs and vice versa in self-experiments.

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Meta-analysisLeading journalWikiHigh evidence score

Stimulus control for insomnia: A systematic review and meta-analysis.

Jansson-Fröjmark M, Nordenstam L, Alfonsson S +3 more · J Sleep Res · 2024 · 23 citations

This meta-analysis found that Stimulus Control (SC) significantly improves sleep onset latency and total sleep time for adults with insomnia compared to doing nothing, with effects similar to other active treatments, making it a valuable strategy for self-experimenters.

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Meta-analysisWikiHigh evidence score

Treatments for enhancing sleep quality in fibromyalgia: a systematic review and meta-analysis.

Pathak A, Kelleher EM, Brennan I +6 more · Rheumatology (Oxford) · 2025 · 6 citations

Cognitive Behavioral Therapy for Insomnia (CBT-I) is the most promising treatment for improving sleep quality in fibromyalgia, showing a moderate benefit, while some medications like pregabalin offer moderate improvements but come with risks, making CBT-I a strong candidate for self-experimentation.

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Meta-analysisWikiHigh evidence score

Efficacy of non-pharmacological interventions on sleep quality in patients with cancer-related insomnia: a network meta-analysis.

Luo Y, He H, Cao C +3 more · Front Neurol · 2024 · 3 citations

This network meta-analysis likely synthesized evidence from multiple studies to identify and rank the most effective non-pharmacological interventions for improving sleep quality in cancer patients experiencing insomnia, offering guidance on which approaches might be most beneficial for self-experimentation.

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Meta-analysisWikiHigh evidence score

The Herbal Medicine Suanzaoren (Ziziphi Spinosae Semen) for Sleep Quality Improvements: A Systematic Review and Meta-analysis.

Yang M, Wang H, Zhang YL +8 more · Integr Cancer Ther · 2023 · 30 citations

A systematic review and meta-analysis found that Suanzaoren (Ziziphi Spinosae Semen), a traditional Chinese herbal medicine, can improve sleep quality, offering a potential natural intervention for individuals experiencing sleep disturbances, particularly within the context of cancer care.

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ObservationalWikiModerate

Association Between Electronic Diary–Rated Sleep, Mood, Energy, and Stress With Incident Headache in a Community-Based Sample

Tarannum Lateef, Debangan Dey, Andrew Leroux +4 more · Neurology · 2024 · 10 citations

Poor sleep quality and decreased energy on the prior day predict morning headaches, while higher stress and increased energy predict later-day headaches — and these effects are large enough that tracking your own daily sleep, energy, and stress with a simple diary could help you predict and prevent headaches.

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Books on this topic

Why We Sleep

Why We Sleep

Matthew P. Walker

Amazon →

Why We Sleep: The New Science of Sleep and Dreams

Why We Sleep: The New Science of Sleep and Dreams

Matthew Walker

Amazon →

The circadian code

The circadian code

Satchin Panda

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Sleep smarter

Sleep smarter

Shawn Stevenson

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The sleep revolution

The sleep revolution

Huffington, Arianna Stassinopoulos

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Say good night to insomnia

Say good night to insomnia

Gregg D. Jacobs

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