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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.
Lack of sleep. This sounds simple but one of the most common causes of fatigue is getting too little sleep. The NHS says around a third of us have bouts of insomnia. If youâre fond of burning the midnight oil, lack of sleep may be causing fatigue. Your age has a lot to do with sleep requirements. Babies need about 16 hours a day and teenagers about nine. Most adults need seven to eight hours a night, but some may need as little as five hours or as much as 10 hours of sleep a day.