Insomnia is the perception or complaint of inadequate or poor-quality sleep because of one or more of the following: 1) difficulty falling asleep 2) waking up frequently during the night with difficulty returning to sleep 3) waking up too early in the morning unrefreshing sleep Insomnia is not defined by the number of hours of sleep a person gets or how long it takes to fall asleep. Individuals vary normally in their need for, and their satisfaction with, sleep. Insomnia may cause prob...

Medicine is a branch of health science concerned with maintaining health and restoring it by treating disease. Medicine is both an area of knowledge (a science), and the application of that knowledge (by the medical profession and other health professionals such as nurses). The various specialized branches of the science of medicine correspond to equally specialized medical professions dealing with particular organs or diseases. ...