Sleeping is the process in which the brain enters an altered state of consciousness. During sleep the person becomes less responsive to the surrounding. Usually during sleep the brain recurs between two very different modes called REM (Rapid Eye Movement) and non-REM sleep which in itself consists of many other factors. Any defects in this process may cause sleep problem.
Sleep loss and untreated sleep disorders influence basic patterns of behavior that negatively affect family health and interpersonal relationships. Fatigue and sleepiness can reduce productivity and increase the chance for mishaps such as medical errors and motor vehicle or industrial accidents. Adequate sleep is necessary to fight off infection, support the metabolism of sugar to prevent diabetes, perform well in school, work effectively and safely.