It isn’t surprising to find happier tweets on weekends than on working days.
Researchers have been delving into people's moods expressed through Twitter and other social networks to detect positive and negative moods throughout days and seasons.
More than half a billion Twitter messages, from 84 countries were analysed by language detection software for positive and negative moods. Generally, most tweets are positive in the morning and climb in the evening.
Researcher’s claim that changes in the daylight do have an effect on people’s messages. Sleep is said to be an accurate cause of mood changes during the day.
Researchers claim that people are emotionally refreshed by sleep and this would explain why positive tweets appear in the morning.