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the claim
Sleepiness in humans is caused by homeostatic sleep pressure and circadian rhythms
the verdict
SUPPORTED
the evidence backs this
Recorded sources
6 sources for · 0 against
Is it true that Sleepiness in humans is caused by homeostatic sleep pressure and circadian rhythms?
Yes. Sleepiness in humans is governed by the two-process model, which integrates homeostatic sleep pressure (Process S) and circadian rhythms (Process C).
Verdict: SUPPORTED · 6 sources for, 0 against · Last checked
The analysis
The claim is a well-established scientific principle known as the two-process model of sleep regulation. Multiple papers (e.g., Papers 5, 7, and 8) explicitly support the role of both homeostatic sleep pressure and circadian rhythms in driving sleepiness and sleep timing. No retrieved papers refute this consensus.
Evidence for · 6
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A, H., K, K., N, D., & EC, M. (2025). Sleep and psychiatric disorders: Bidirectional interactions and shared neurobiological mechanisms.. doi.org. https://doi.org/10.1371/journal.pmen.0000531
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More for · 5
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A, J. & L, R. (2026). The Role of Sleep Banking in Reducing Cognitive and Motor Impairments from Subsequent Sleep Restriction: A Narrative Review.. doi.org. https://doi.org/10.3390/clockssleep8010008
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Y, X., F, X., Z, N., W, Z., C, Y., & J, K. (2026). A new Two-process Model: A Unified Theoretical Foundation for sleep - Wake Transitions, Stimulus - Response, Sleepiness. doi.org. https://doi.org/10.21203/rs.3.rs-10406956/v1
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B, G., K, Y., Y, D., W, Z., X, C., C, X., Y, C., P, Q., N, G., M, B., T, M., & H, R. (2026). Domain-specific circadian rescue following sleep deprivation.. doi.org. https://doi.org/10.1093/sleep/zsag054
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S, Z., Y, L., J, T., W, S., H, L., Y, H., Y, L., & J, X. (2026). Circadian dimensions in insomnia disorder: mechanistic evidence, candidate phenotypes, and a phenotype-stratified research framework.. doi.org. https://doi.org/10.3389/fpsyt.2026.1884632
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DJ, D. (2026). Human data at odds and in confirmation of the two-process model of sleep regulation-a perspective.. doi.org. https://doi.org/10.1038/s44323-026-00083-3
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Receipt History
first checked04 Aug 2026
judged → SUPPORTED · 7904 Aug 2026
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