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Med."],"abstract":"<jats:title>Abstract<\/jats:title><jats:p>The idea that abnormal human activities follow multi-day rhythms is found in ancient beliefs on the moon to modern clinical observations in epilepsy and mood disorders. To explore multi-day rhythms in healthy human behavior our analysis includes over 300 million smartphone touchscreen interactions logging up to 2 years of day-to-day activities (<jats:italic>N<\/jats:italic>401 subjects). At the level of each individual, we find a complex expression of multi-day rhythms where the rhythms occur scattered across diverse smartphone behaviors. With non-negative matrix factorization, we extract the scattered rhythms to reveal periods ranging from 7 to 52 days \u2013 cutting across age and gender. The rhythms are likely free-running \u2013 instead of being ubiquitously driven by the moon \u2013 as they did not show broad population-level synchronization even though the sampled population lived in northern Europe. 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