With the increase of age, insomnia is a big problem that plagues many elderly people. Poor sleep in the elderly is mainly manifested as difficulty in falling asleep, restless sleep, easy to wake up, increase in the number of awakenings, more difficult to fall asleep again after waking up, stage of sleep and short deep sleep time. The main causes of sleep disorders in the elderly are: 1. Organic brain diseases: With the increase of age, the degree of arteriosclerosis in the elderly gradually aggravated, and may be accompanied by hypertension, cerebral hemorrhage, cerebral infarction, dementia, tremor paralysis and other diseases. These diseases can reduce blood flow to the brain, causing brain metabolic disorders and sleep disorders. 2, environmental factors: environmental factors are also unstable factors that cause the elderly to have difficulty sleeping and wake up easily, such as frequent changes to live in different children’s homes, living rooms near the street, noisy neighbors, noisy and unsettling nearby environment or family members are sleeping late, and other reasons can affect the sleep of the elderly. 3, systemic diseases: With the increase of age, the diseases of the elderly will gradually increase, such as diabetes, coronary heart disease, pulmonary heart disease, lumbar spine disease, Parkinson’s disease, depression, anxiety, peripheral neuropathy, kidney disease and so on, all these diseases may seriously affect the sleep of the elderly. 4, drug factors: before going to bed to take drugs that cause nerve excitement, or take diuretic drugs can affect the impact on the quality of sleep. 5, psychological factors: life, work and other environmental impact on the elderly mood, or all day worry about their children, afraid that their children are too much pressure, they give their children trouble, resulting in depressed mood, resulting in mental tension, etc.; 6, less activity during the day, too much sleep. The elderly are usually sleepy, there is not too much activity during the day, or often lying watching TV, in a quiet environment, more nap during the day, which leads to insomnia at night. So proper exercise during the day, more going to chat with others and less sleeping can improve the quality and quantity of sleep at night. In conclusion, the elderly’s inability to sleep at night may be caused by a variety of complex factors, including changes in various factors such as physiology, psychology, environment, medication and disease, but it is also possible to adjust as long as the cause is found and treated for the cause.