Insomnia is a disease, patients can consult the outpatient clinic of psychiatry and neurology for examination and treatment. The causes of insomnia are mainly the following: 1, psychological factors are the most important causes of insomnia, such as emotional tension, mood anxiety, depression, usually thinking more or some sudden events, resulting in greater psychological fluctuations, are likely to lead to the problem of insomnia, in turn insomnia will affect the psychological state of the person; 2, with the increase in age, part of the patients 3, the cause of insomnia is also related to environmental factors, such as poor sleep environment, too much noise, too much light, will cause interference with sleep; 4, and the patient’s own life irregularities, such as patients often stay up late, before bedtime to drink strong tea, strong coffee and other substances, may lead to nerve dysfunction and cause insomnia in patients.