People usually spend 1/3 of the day and night sleeping, i.e., they go to sleep at night and wake up during the day, forming a sleep-wake rhythm. Sleep-wake rhythm disorders are sleep disorders caused by a sleep-wake rhythm that is different from the usual one. The disorder is usually seen in adults, but is rarely seen in childhood or adolescence. Prevention and relief methods of sleep-wake time disorders: 1. Reduce mental stimulation before bedtime and avoid intake of stimulants. Such as reading horror novels, watching exciting horror suspense films, etc.; such as smoking, drinking coffee, strong tea and excitement drugs, etc., which can easily cause insomnia. 2.Adjust the sleep rhythm. Develop proper sleep-wake habits, for example, only go to bed when you feel like sleeping, and if you do not fall asleep 15-20 minutes after going to bed, you should immediately get out of bed and do some relaxing activities to relax your body and mind until you feel like sleeping again. 3, reduce the stimulating activities before going to bed. Avoid exercising before bedtime, as well as engaging in highly concentrated mental work. For people who must work at night, they should deliberately relax 1 to 2 hours before bedtime, so that their physical and mental strength to soothe down, so as not to affect sleep. 4.Limit ineffective sleep. Some patients with sleep disorders have to lie in bed for a lot of time every day, but the actual sleep time is very short. For example, someone lying in bed for 8 hours, while the actual sleep time is only 5 hours, the other 3 hours belong to the invalid sleep. Total sleep time, time in bed is called sleep efficiency, the more ineffective sleep, the worse the sleep efficiency. 5.Increase excitement during the day and increase daylight hours. Long-term ambulatory workers, housewives, retirees, etc., they have less social activities carried out during the day, less physical activity of a certain intensity, and usually not enough daylight hours, all these factors can lead to the nighttime sleep disorders are more common in clinical practice. These people should increase outdoor activities during the day and increase sunlight hours appropriately, while at night they should reduce light, noise and other disturbances.