According to an analysis of 2.4 million tweets in 84 countries, the day dawns full of promise. But moods go downhill during the day, finally rebounding at night.
Seasonal variations in day length and sleep cycles affect people in similar ways across cultures, report Cornell University researchers Scott Golder, a doctoral student in the field of sociology, and Michael Macy, professor of sociology, in a study published recently in the journal Science.
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