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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 Changes in the body's natural internal clock, causing some people to fall asleep earlier in the evening) 2  Chronic disease, such as heart failure. 3  Certain medicines, herbs, supplements, and recreational drugs.  Depression (depression is a common cause of sleep problems in people of all ages)