In a new study from Uppsala University, researchers found men’s sleep may be more powerfully influenced by the lunar cycle than women’s.
Previous studies have produced somewhat conflicting results on the association between the lunar cycle and sleep, with some reporting an association whereas others did not.
There are several possible explanations for these discrepant findings, such as that some of the results were chance findings.
However, many past studies investigating the association of the lunar cycle with human sleep did not control their analyses for confounders known to impact human sleep, such as obstructive sleep apnea and insomnia.
During the waxing period, the amount of illuminated moon surface as seen from Earth increases, and the moment that the moon crosses a location’s meridian gradually shifts to late evening hours.
In contrast, during the waning period, the illuminated surface decreases and the moment that the moon crosses a location’s meridian gradually shifts to daytime hours.
In the study, the team used one-night at-home sleep recordings from 492 women and 360 men.
They found that men whose sleep was recorded during nights in the waxing period of the lunar cycle exhibited lower sleep efficiency and increased time awake after sleep onset compared to men whose sleep was measured during nights in the waning period.
In contrast, the sleep of women remained largely unaffected by the lunar cycle. The results were robust to adjustment for chronic sleep problems and obstructive sleep apnea severity.
One mechanism through which the moon may impact sleep is sunlight reflected by the moon around times when people usually go to bed.
In addition, a recent study suggests that the male brain may be more responsive to ambient light than that of females.
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The study is published in the journal Science of the Total Environment. One author of the study is Christian Benedict.
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