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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.
Causes of Sleep Disorders. Sleep disorders are very common and can result from a number of causes. Stress, illness, diet (e.g., caffeine, alcohol), and medications (e.g., antidepressants) all can cause sleep problems. Narcolepsy is the only major sleep disorder with a known genetic cause (i.e., hereditary).