On nights leading up to a full moon, people go to bed later and sleep for shorter periods of time, a new study reveals.
US researchers observed the same variations in both the time of sleep onset and the duration of sleep among indigenous people living in rural settings and college students in urban settings.
Sleep cycles generally oscillated during the 29.5-day lunar cycle, during which time the moon gradually goes from being effectively invisible (a new moon), to a full bright, gleaming sphere (full moon), and back again.
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