NIH Curriculum Supplement Series — Information about Sleep (https://www.ncbi.nlm.nih.gov/books/NBK20359/)
Sleep Foundation — NREM Sleep (https://www.sleepfoundation.org/stages-of-sleep/nrem-sleep)
PMC — Circadian Rhythms in Sleep and Recovery (https://pmc.ncbi.nlm.nih.gov/articles/PMC11221196/)
CDC — Sleep duration recommendations for adults (7–9 hours)
American Academy of Sleep Medicine (AASM) — clinical sleep guidelines
Van Dongen HPA, Maislin G, Mullington JM, Dinges DF — The Cumulative Cost of Additional Wakefulness: Dose-Response Effects on Neurobehavioral Functions and Sleep Physiology From Chronic Sleep Restriction and Total Sleep Deprivation, Sleep 26(2):117-126, 2003 — https://academic.oup.com/sleep/article-pdf/26/2/117/13662142/sleep-26-2-117.pdf
Belenky G, Wesensten NJ, Thorne DR, Thomas ML, Sing HC, Redmond DP, Russo MB, Balkin TJ — Patterns of performance degradation and restoration during sleep restriction and subsequent recovery: a sleep dose-response study, Journal of Sleep Research 12:1-12, 2003 — https://onlinelibrary.wiley.com/doi/abs/10.1046/j.1365-2869.2003.00337.x
Diekelmann S, Born J — The memory function of sleep, Nature Reviews Neuroscience 11:114-126, 2010 — https://www.nature.com/articles/nrn2762
Dijk D-J, Czeisler CA — Contribution of the Circadian Pacemaker and the Sleep Homeostat to Sleep Propensity, Sleep Structure, Electroencephalographic Slow Waves, and Sleep Spindle Activity in Humans, Journal of Neuroscience 15:3526-3538, 1995 — https://pmc.ncbi.nlm.nih.gov/articles/PMC6584681/
Drake C, Roehrs T, Shambroom J, Roth T — Caffeine Effects on Sleep Taken 0, 3, or 6 Hours before Going to Bed, Journal of Clinical Sleep Medicine 9(11):1195-1200, 2013 — https://pmc.ncbi.nlm.nih.gov/articles/PMC3805807/
Chang A-M, Aeschbach D, Duffy JF, Czeisler CA — Evening use of light-emitting eReaders negatively affects sleep, circadian timing, and next-morning alertness, PNAS 112(4):1232-1237, 2015 — https://www.pnas.org/doi/10.1073/pnas.1418490112
Schollhorn I, Stefani O, Lucas RJ, Spitschan M, Slawik HC, Cajochen C — Melanopic irradiance defines the impact of evening display light on sleep latency, melatonin and alertness, Communications Biology 6, 2023 — https://pmc.ncbi.nlm.nih.gov/articles/PMC9974389/
Nielsen TA — reviews of REM and NREM sleep mentation (2000; 2011), NREM dream recall ~50-60%, as cited in Dream Generation and Recall in Daytime NREM Sleep of Patients With Narcolepsy Type 1, 2020 — https://pmc.ncbi.nlm.nih.gov/articles/PMC7729059/
Guinness World Records — What's the limit to how long a human can stay awake? And why we don't monitor the record, 2023 (Robert McDonald 453 h 40 min, 1986; monitoring ended 1997) — https://www.guinnessworldrecords.com/news/2023/1/whats-the-limit-to-how-long-a-human-can-stay-awake-733188
Read end to end and corrected: August 10, 2026. Numbers checked: August 10, 2026.