Sleep Optimization

Sleep Extension Benefits

• Reaction time: 8-10% improvement
• Sprint times: 3-5% faster
• Accuracy: 10-15% improvement

Sleep Loss Effects

• <6 h: 10-30% performance decrement
• 8 h sleep: may be insufficient for athletic populations
• Recovery impaired below 7 h

Chronic restriction & long sleep ↔ stroke (anchors)

• Controlled dose–response restriction: Van Dongen et al. 2003 (Sleep; PMID 12683469; van-dongen-2003-chronic-sleep-restriction-dose-response-sleep) randomised healthy adults to 4 h / 6 h / 8 h time in bed for 14 nights—cumulative objective cognitive deficits on 6 h or less reached severities framed as comparable to ≤2 nights of total sleep loss while subjective sleepiness plateaued (“benign” myth caution).
• Epidemiologic U-shape (stroke): Wang et al. 2022 (Sleep Med; PMID 35245890; wang-2022-sleep-duration-stroke-meta-sleep-med) meta-analysed cohorts showing higher stroke incidence/mortality for both short and long sleep with U-shaped dose–response narratives—pair with scheduling targets and OSA workups when long sleep is habitual.

Melatonin supplementation (chronic insomnia; age-stratified)

Choi & Suh 2022 (Sleep Med Rev; PMID 36179487; choi-2022-melatonin-chronic-insomnia-sleep-med-rev) synthesised 24 placebo-controlled chronic insomnia RCTs: non-comorbid cohorts showed significant improvements in sleep onset latency and total sleep time with melatonin only in children/adolescents, while adults showed no significant pooled gains in SOL, TST, or sleep efficiency; comorbid insomnia analyses favoured SOL improvements across ages but adult data were sparse (authors call for larger adult trials).

Digital mindfulness app (insomnia-symptom enriched RCT)

Huberty et al. 2021 (Gen Hosp Psychiatry; PMID 34537477; huberty-2021-meditation-app-depression-anxiety-sleep-gen-hosp-psych) — 239 adults (ISI ≥10, meditation-naïve); 8 weeks of a commercial meditation smartphone app vs control improved depression and anxiety with pre-sleep arousal mediating part of the depression pathway in authors’ models—questionnaire outcomes, not PSG.

Programmed exercise (PSQI context)

Rubio-Arias et al. 2017 (Maturitas; PMID 28539176; rubio-arias-2017-exercise-psqi-maw-maturitas-meta) pooled 4 RCTs (n = 660 middle-aged women): small PSQI improvement with programmed exercise (overall MD −1.34, p = 0.05), clearest in a moderate aerobic subgroup (MD −1.85), while low-intensity yoga did not reach significance; pooled ISI insomnia severity was not statistically significant—use as adjunct context, not a replacement for CBT-I in chronic insomnia.

Protocol

• Target 8-10 h/night for optimal recovery
• Consistent sleep/wake timing
• Cool, dark, quiet sleep environment

Chronic insomnia (CBT-I evidence hub)

Cognitive behavioral therapy for insomnia (CBT-I) bundles stimulus control, sleep restriction / compression, cognitive therapy, sleep hygiene, and relaxation in guideline-style programs. Trauer et al. 2015 (Ann Intern Med; PMID 26054060; trauer-2015-cbti-chronic-insomnia-systematic-review-annals) pooled 20 face-to-face multimodal RCTs (n = 1,162) in chronic primary insomnia vs inactive controls: about 19 min shorter sleep-onset latency, 26 min less wake after sleep onset, and ~10 percentage points higher sleep efficiency at post-treatment; total sleep time moved only modestly with a CI spanning null; comorbid insomnia trials were excluded—use with clinician judgment for OSA, depression, or circadian overlap.

• Early internet-delivered CBT-I (ISI outcomes): Ritterband et al. 2009 (Arch Gen Psychiatry; PMID 19581560; ritterband-2009-internet-behavioral-intervention-insomnia-arch-gen-psychiatry) randomised 45 adults to a structured online behavioural insomnia programme vs wait-list—large Insomnia Severity Index improvements sustained to 6 months in the primary report (small n; early digital delivery).
• Tai Chi Chih vs CBT-I (breast cancer survivors): Irwin et al. 2017 (J Clin Oncol; PMID 28489508; irwin-2017-tai-chi-chih-vs-cbti-insomnia-breast-cancer-jco) noninferiority trial (n = 90) showing Tai Chi Chih met the prespecified margin versus CBT-I for PSQI-defined insomnia treatment response at 15 months—cancer-survivor population; do not merge with primary insomnia CBT-I pools without reading eligibility.
• Yoga + sleep (menopause strata RCT): Susanti et al. 2022 (Nurs Health Sci; PMID 35191141; susanti-2022-yoga-menopause-sleep-rct) randomised 104 vs 104 women to 20 weeks of yoga vs control; PSQI global sleep quality improved in peri- and postmenopausal women after covariate adjustment (p < 0.001) but not in premenopausal participants—questionnaire-tier outcomes; not a substitute for CBT-I in chronic primary insomnia.

Related registry

Evening light hygiene (evening-light-hygiene) — pre-sleep dim / amber spectra and short-wavelength–blocking lenses, including the pooled Shechter et al. 2020 synthesis (shechter-2020-blue-light-filtering-sleep-meta) when readers optimize bedroom photic dose alongside duration.

Daytime napping (daytime-napping) indexes planned naps, habitual nap duration, and acute cognitive nap trials—keep primary nocturnal sleep targets here; nap epidemiology is a different evidence stream (reverse causation and comorbidity are common confounds).

Magnesium supplementation (magnesium-supplementation) indexes oral mineral RCTs and reviews on insomnia severity / sleep latency—adjunct to scheduling and environment changes above, not a substitute for evaluating OSA, depression, or circadian disorders.

Progressive muscle relaxation (progressive-muscle-relaxation) hosts pooled PMR vs control RCT / meta-analysis rows on PSQI and global sleep-quality scales—use as a somatic relaxation adjunct next to scheduling, light, and mineral evidence streams above.

Tertiary map

Wikipedia: Sleep (wikipedia-sleep-overview) frames sleep stages, homeostatic pressure, and circadian vocabulary—sleep extension, efficiency, and performance RCTs on this page stay PubMed-first. Wikipedia: Sleep hygiene (wikipedia-sleep-hygiene-overview) lists behavioral and environmental bedtime practices (scheduling, stimulus control, bedroom factors)—still PubMed-first for effect sizes next to Coyle / Halson rows here. Wikipedia: Insomnia (wikipedia-insomnia-overview) orients chronic insomnia vocabulary, comorbidity threads (pain, mood, undiagnosed OSA), and differential from insufficient sleep—Trauer-style CBT-I minutes and efficiency points remain on the PubMed-linked row above, not encyclopedia summary tables. For light-based regulation see Circadian-timed light (circadian-light) and Morning light therapy (morning-light-therapy).