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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.
And a lack of sleep can cause all sorts of physical and mental problems, from mood changes to overeating. Specifically, researchers have found that not following healthy sleeping habits can cause: 1  Loss of energy and feelings of exhaustion. 2  Anxiety, depression, or irritability. 3  Memory problems, trouble paying attention, delayed reactions, and a reduced ability to learn.