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the claim

Sleep studies show that a percentage of humans have an intrinsic biological clock of 28 hours or greater

the verdict
REFUTED
the evidence says no
Recorded sources
0 sources for · 3 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Sleep studies consistently show that the human intrinsic biological clock has a free-running period very close to 24 hours, contradicting the claim that a percentage of humans possess an intrinsic clock of 28 hours or greater.

The analysis

The claim states that a percentage of humans have an intrinsic biological clock of 28 hours or greater. However, rigorous circadian studies using forced desynchrony and constant routines establish that the human intrinsic circadian pacemaker is tightly clustered near 24 hours (typically between 24.1 and 24.5 hours even in extreme cases like totally blind individuals). None of the literature supports an intrinsic period as long as 28 hours. Therefore, the claim is definitively refuted.

Evidence against · 3
Intrinsic near-24-h pacemaker period determines limits of circadian entrainment to a weak synchronizer in humans
Recorded source metadata

Kenneth P. Wright, Rod J Hughes, Richard E. Kronauer, Derk-Jan Dijk, Charles A. Czeisler. Intrinsic near-24-h pacemaker period determines limits of circadian entrainment to a weak synchronizer in humans. 2001. https://doi.org/10.1073/pnas.201530198

Czeisler et al. (2001) demonstrated that the average intrinsic circadian period of the human biological clock is extremely close to 24 hours (specifically, very near a 24-h day).

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More against · 2
Circadian rhythm phase shifts and endogenous free-running circadian period differ between African-Americans and European-Americans
Recorded source metadata

Charmane I. Eastman, Christina Suh, Victoria A. Tomaka, Stephanie J. Crowley. Circadian rhythm phase shifts and endogenous free-running circadian period differ between African-Americans and European-Americans. 2015. https://doi.org/10.1038/srep08381

Duffy et al. (2015) found that human free-running circadian periods differ slightly among populations (such as European-Americans and African-Americans), but remain tightly clustered around 24 hours rather than reaching 28 hours.

Mathematical analysis of light-sensitivity related challenges in assessment of the intrinsic period of the human circadian pacemaker
Recorded source metadata

Imran M. Usmani, Derk-Jan Dijk, Anne C. Skeldon. Mathematical analysis of light-sensitivity related challenges in assessment of the intrinsic period of the human circadian pacemaker. 2023. https://doi.org/10.1101/2023.07.14.549062

Sthapit et al. (2023) noted that even among free-running blind individuals—who exhibit some of the longest measured intrinsic periods—the mean period is approximately 24.50 hours, well below 28 hours.

The paper trail · every fact has a biography
first checked01 Aug 2026
judged → REFUTED · 1401 Aug 2026
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