The elderly always sleep, generally divided into the following reasons: First, the elderly have hypertension, diabetes, coronary heart disease, hyperlipidemia, carotid atherosclerotic plaque formation these chronic diseases, underlying diseases, and the control of these underlying diseases are not ideal, so that the elderly usually always sleep. Second, the existence of cerebral atherosclerosis, cerebral blood supply deficiency, in this case, the elderly brain blood supply is reduced, the elderly brain in a relative ischemia, lack of oxygen, the elderly always want to sleep. Third, the elderly unfortunately suffer from a new disease, such as pneumonia, peptic ulcer, gastrointestinal tumor, renal insufficiency, malnutrition, anemia and so on, all these conditions can cause the elderly always want to sleep.