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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.
Furthermore, unhealthy conditions, disorders and diseases can also cause sleep problems, including: 1  Pathological sleepiness, insomnia and accidents. 2  Hypertension and elevated cardiovascular risks (MI, stroke) 3  Emotional disorders (depression, bipolar disorder) 4  Obesity; metabolic syndrome and diabetes. 5  Alcohol and drug abuse.