Elderly people sleep a lot mainly due to diseases and psycho-psychological factors, the common causes are: 1, Alzheimer’s disease, moderate to severe Alzheimer’s patients will appear sleep-wake cycle disorders, patients can be continuously drowsy for a long time, but also restlessness can not sleep. 2, brain diseases, cerebral infarction, cerebral hemorrhage and encephalitis in elderly patients, due to cortical damage will appear drowsiness. 3, pulmonary encephalopathy, pneumonia or emphysema patients, due to carbon dioxide storage inhibit the cerebral cortex, will also cause drowsiness. 4, physical weakness, physical weakness, low immunity of the elderly, due to reduced mobility, some even long-term bedridden, which leads to mental depression, sleep for a long time. 5, psycho-psychological factors, long-term alone living Elderly people, due to the lack of communication objects and other interests, which leads to nothing to do and sleep more.