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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.
1 Not enough sleep also causes stress on the body, which triggers it to slow metabolism and store fat. 2  It shrinks your brain. 3  Researchers found that chronic insomniacs had smaller, less-dense brains, which affected crucial parts of their neurological systems like decision-making.