How do I often lose sleep at night?

Often insomnia at night may be due to recent mental stress, work pressure is too large, or the recent reversal of day and night, caused by excessive nerve excitement at night, pay attention to the recent improvement of living habits, go to bed early and get up early, about two hours before bed can be appropriate exercise, increase certain fatigue, take a hot bath before bed, drink a cup of warm milk, can effectively improve symptoms.