One third of a person’s life is spent in sleep, and five days without sleep a person will die, so it is clear that sleep is a physiological need of human beings. As a process necessary for life, sleep is an important part of the body’s recovery, integration and consolidation of memory, and is an indispensable component of health. According to the World Health Organization survey, 27% of people have sleep problems. The Global Sleep and Health Program, sponsored by the International Psychiatric Health Organization, launched a global campaign in 2001 to designate March 21, the first day of spring, as “World Sleep Day”. Time for sleep 1. 9-11pm: The immune system (lymph) detoxification time, this time should be quiet or listen to music. 2.11pm-1am: Detoxification of the liver should be carried out in a sound sleep. 3.1-3 am: bile detoxification, also need to be carried out in a sound sleep. 4. 3-5 am: detoxification of the lungs. This is why people with coughs cough most violently during this time, because the detoxification action has gone to the lungs; do not apply cough medicine, so as not to inhibit the elimination of waste products. 5, 5-7 a.m.: detoxification of the large intestine, should go to the toilet to defecate. 6, 7-9 a.m.: the small intestine to absorb a large number of nutrients time, should eat breakfast. The best way to heal the sick eat early, before 6:30 a.m., before 7:30 a.m. Those who do not eat breakfast should change their habits, even if they dragged to 9 or 10 a.m. to eat are better than not. Midnight to 4:00 a.m. is the time of spinal blood production, you must sleep well, should not stay up late. According to the recommendations of sleep experts, in order to have a good sleep, in the environment need to pay attention to do the following: 1, layout the bedroom. 2, sleep should be in a safe, comfortable, quiet and relaxing place. 3, carefully choose the bed and bedding, because a third of your life will spend with them. The bed is too soft or too hard can cause back pain. Bedding should also be kept comfortable. 4.Avoid outside disturbances (light and noise). 5, keep the air and humidity in the bedroom, if necessary, you can put a wet towel on the heater or install a humidifier. 6.The temperature of the bedroom should be maintained at 16℃ to 18℃.