A 2021 ScienceAdvances analysis of sleep cycles suggests that our sleep is synchronized with the moon’s phases regardless of ethnic or cultural differences, and even where light pollution outshines moonlight. Learn more:
Data were recorded during field campaigns in three consecutive years: September to October 2016 and 2017 and October to November 2018. The three campaigns were carried out during the spring to keep environmental factors as stable as possible.We also analyzed sleep data from 464 college students [mean age =21.
We use a second classification of phases through the moon cycle according to the availability of moonlight during the early night hours, which we refer to as “moonlight phases.
To detect and discard very long and very short sleep events , as well as irregular sleep events , we analyzed our sleep databases for outliers in two steps: first, looking at values of duration, and then at times of sleep onset according to the time of dusk. We performed the analyses through the median absolute deviation method setting a threshold of three MADs, using the Routliers package for R .
To explore the patterns of sleep duration and timing through the moon cycle in the Toba/Qom communities, we selected the participants with data for at least 80% of the nights in the cycle. Sixty-nine participants met this condition: 20 in Ru-LL, 23 in Ru-NL, and 26 in Ur. Each participant’s data points were first averaged by night in the cycle , and data for any missing nights were completed by linear interpolation.
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