Journal
SCIENCE
Volume 333, Issue 6051, Pages 1878-1881Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1202775
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Funding
- NSF [BCS-0537606, IIS-0705774, IIS-0910664]
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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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