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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.
There May Be a Medical Cause. People who feel they sleep perfectly well may still be troubled by excessive daytime sleepiness because of a variety of underlying medical illnesses. A sleep disturbance may be a symptom of a health issue or an adverse effect of therapy to treat the problem. The stress of chronic illness can also cause insomnia and daytime drowsiness. Common conditions often associated with sleep problems include heartburn, diabetes, cardiovascular disease, musculoskeletal disorders, kidney disease, mental health problems, neurological disorders, respiratory problems, and thyroid disease.