Chinese medicine believes that sleep and wakefulness are the result of alternation of yin and yang. Huangdi Neijing said, "When yang is exhausted, you lie down, while when yin is exhausted, you lie down." . Noon refers to 23: 00 ~ 1: 00, when the yin is the most abundant and the yang is the weakest; Noon means11:00 ~13: 00. At noon, the yang is the strongest and the yin is the weakest. Noon and noon are the times when yin and yang alternate, and it is also the time when the body's menstrual qi "closes yin" and "closes yang". Sleeping in childhood is the best way to nourish yin, and the sleep effect is the best; Sleeping at noon is good for tonifying yang. Therefore, no matter how late you sleep at night, don't exceed 23 o'clock; Take a nap at noon 1 1 to afternoon 1, and it is appropriate to take a nap at 1h in 30 minutes. A good night's sleep can nourish yin and yang.

In addition, according to the theory of traditional Chinese medicine, noon is the time when the liver meridian runs, and noon is the time when qi and blood flow into the heart meridian. A good nap in the middle school can not only nourish yin and yang, but also nourish the liver and heart. When the weather is hot, people sweat a lot, so they should drink more water to replenish the lost water. However, drinking water is also particular. Some people drink too much boiled water or sugar water after sweating, while others only drink fruit juice or drinks, which is not desirable. The correct way is: under normal circumstances, you can drink more boiled water to replenish water, and take a small number of times to replenish water, which can not only slow down perspiration, but also prevent loss of appetite and reduce water evaporation; After sweating a lot, you should drink more salty boiled water or salty tea to supplement the salt lost in your body.