What would cause somebody to sleep 15 to 20 hours a day on an ongoing basis?

Answer by  AB95 (17)

May be caused by a lost emotional integrity. Another reason may be a great disappointment in many aspects of the person's mental life: a failing contact with what's real, suicide thoughts, personal and intimate struggles which cause an inner depression of physical consequences: oversleeping, losing appetite, self-interes,the surronding and etc.

Answer by  tamarawilhite (17883)

This can be caused by hormonal imbalances, such as the pancreas or thyroid. It can also be a sign of drug use. See a doctor for diagnosis.