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The average sleeping time for an adult is eight hours. There are several causes as to why a person sleeps too much -- a condition medically termed as hypersomnia or oversleeping. However, some common causes are stress, lack of self-discipline, and poor sleep in a span of a couple of days.
Fatigue Cause No. 1: Not Enough Sleep. It may seem obvious but you could be getting too little sleep. That can negatively affect your concentration and health. Adults should get seven to eight hours every night. Fix: Make sleep a priority and keep a regular schedule.