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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.
Sarcoidosis is associated with excessive daytime sleepiness. Complications from sarcoidosis usually happen in only the most serious cases, and can include heart, kidney, and lung damage. Long-term use of corticosteroids may cause: 1  Ulcers. 2  Diabetes. 3  High blood pressure. 4  Osteoporosis. 5  Infections, such as tuberculosis.