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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.
The following causes of Not enough sleep are diseases or conditions that affect more than 200,000 people, but less than 1 million people in the USA: