Insomnia is a relatively common symptom that exists in many people, leading to insomnia in the middle of the night for a number of reasons: 1, mainly related to the patient’s spiritual and psychological factors, the patient’s personality is more introverted or mental stress, work is more stressful, long-term anxiety, depression is more likely to have insomnia. 2, related to the patient’s lifestyle, such as often work the night shift or usually stay up late, irregular work habits, sleep disorders. 3, if the patient before going to bed to watch the plot of intense film and television drama or drink strong tea, strong coffee and other sound drinks that can excite the cerebral cortex, but also easy to cause insomnia in the middle of the night.