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      Diurnal and seasonal mood vary with work, sleep, and daylength across diverse cultures.

      Science (New York, N.Y.)

      Work, Sleep, Seasons, Humans, Cross-Cultural Comparison, Circadian Rhythm, Blogging, Affect

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          Abstract

          We identified individual-level diurnal and seasonal mood rhythms in cultures across the globe, using data from millions of public Twitter messages. We found that individuals awaken in a good mood that deteriorates as the day progresses--which is consistent with the effects of sleep and circadian rhythm--and that seasonal change in baseline positive affect varies with change in daylength. People are happier on weekends, but the morning peak in positive affect is delayed by 2 hours, which suggests that people awaken later on weekends.

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          Journal
          10.1126/science.1202775
          21960633

          Chemistry

          Work, Sleep, Seasons, Humans, Cross-Cultural Comparison, Circadian Rhythm, Blogging, Affect

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