Study: Mood, time of day may be correlated

LOS ANGELES

Researchers with Cornell University used Twitter to monitor the attitudes of nearly 2.5 million people in 84 countries.

They tracked words like "happy" over the course of a day and week.

It turns out that people are happiest around 7 or 8 a.m. weekdays and on weekends.

However, no matter what day it is, our mood generally dips in the mid-morning, and then rises again in the evening.

Scientists think that might have to do with our biological clocks.

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