The health preservation of traditional Chinese medicine is to do it according to the nature of the human body every day and when. "The order of heaven" means that we must follow the order of birth, growth, gathering and collection. So is our body. It is courage to hide every eleven days, and the season of the child, the season of the child, refers to the two hours from 1 1 to the next morning 1 o'clock, because the sun has just come out and I have to sleep at this time. If you don't have a rest at this time and the yang doesn't rise, you will dissipate the most precious vitality; Clown refers to the period from 1 to 3: 00 in the morning, when the liver is lit, that is to say, the liver meridian in the human body is on duty during this period, and it is the time to nourish liver blood. If you don't sleep, you can't afford liver blood; From 3: 00 to 5: 00 in the morning, the lung meridian is in season, and the lung redistributes qi and blood. People's sleep should be the heaviest, because the transition from static to dynamic must be completed through deep sleep. This redistribution process must be completed in deep sleep; From 5 am to 7 am, defecation is a normal phenomenon in the human body.