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the claim

The lunar cycle affects human sleep duration and quality.

the verdict
CONTESTED PARTIAL
Recorded sources
5 sources for · 1 against

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

Is it true that the lunar cycle affects human sleep duration and quality?

Partly. Several small studies report that sleep duration and quality vary with the lunar cycle, including a 31-person Swiss study and a 319-patient polysomnography analysis, while a forum critique cites larger studies finding no lunar effect. The evidence is mixed and drawn from small or narrow samples, so it only partially addresses the general claim.

Verdict: CONTESTED PARTIAL · 5 sources for, 1 against · Last checked

The private library was unavailable for some searches in this check. Missing library results are not evidence against the claim.

Evidence for · 5
Physical activity, sleep duration and metabolic health in children fluctuate with the lunar cycle: science behind the myth
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Physical activity, sleep duration and metabolic health in children fluctuate with the lunar cycle: science behind the myth. (n.d.). cir.nii.ac.jp. https://doi.org/10.1111/cob.12092

2 recorded entries grouped as this source

Additional records of the same source are shown below. They are not counted as additional sources.

Physical activity, sleep duration and metabolic health in children fluctuate with the lunar cycle: science behind the myth
2015
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Sjödin, A., Hjorth, M., Damsgaard, C., Ritz, C., Astrup, A., & Michaelsen, K. F. (2015). Physical activity, sleep duration and metabolic health in children fluctuate with the lunar cycle: science behind the myth. doi.org. https://doi.org/10.1111/cob.12092

Evidence against · 1
Does the phase of the Moon affect human sleep patterns?
2013
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Does the phase of the Moon affect human sleep patterns?. (2013). skeptics.stackexchange.com. https://skeptics.stackexchange.com/questions/17391/does-the-phase-of-the-moon-affect-human-sleep-patterns

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More for · 4
In-the-Wild Exploration of the Impact of the Lunar Cycle on Sleep in a University Cohort with Oura Rings
2024
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Arai, S., Vargo, A. W., Tag, B., & Kise, K. (2024). In-the-Wild Exploration of the Impact of the Lunar Cycle on Sleep in a University Cohort with Oura Rings. doi.org. https://doi.org/10.1145/3652920.3653044

Effects of seasonal factors on brain function: Systematic review and future perspectives.
2025
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J, M., D, R., & G, D. (2025). Effects of seasonal factors on brain function: Systematic review and future perspectives.. doi.org. https://doi.org/10.1016/j.isci.2025.114066

Sleepless night, the moon is bright: longitudinal study of lunar phase and sleep
2006
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Sleepless night, the moon is bright: longitudinal study of lunar phase and sleep. (2006). doi.org. https://doi.org/10.1111/j.1365-2869.2006.00520.x

Association between lunar phase and sleep characteristics
2014
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Association between lunar phase and sleep characteristics. (2014). doi.org. https://doi.org/10.1016/j.sleep.2014.06.020

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