摘要: In recent years the effectiveness of hypnotic drugs has had to be assessed in terms a greatly increased knowledge physiology and pathology sleep. The normal pattern sleep wakefulness involves cyclic alternation between three rather than two basically dissimilar states brain body — alert wakefulness, rapid-eye-movement (REM) non-rapid-eye-movement (NREM) this individual people results from interaction many influences biological (including genetic, early developmental later degenerative influences), psychological, social environmental factors, various physical psychiatric disorders, most which affect central nervous system. quality is not related any simple or constant manner either its duration proportions time spent each stage Among disorders sleep, insomnia far more common problem medical management are enuresis, narcolepsy, somnambulism nightmares.