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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.
Published: 05/20/2013 04:03 PM EDT on LiveScience. Too little sleep increases the risk of car crashes for young drivers, a new study confirms.