It is said in Huangdi Neijing, an ancient Chinese medicine book, that yang exhaustion leads to lying down, while yin exhaustion leads to fainting. It shows that sleep and wakefulness are the result of alternation of yin and yang. I fell asleep when the yin was full, and woke up when the yang was strong. It is from 23: 00 p.m. to early morning 1, when yin flourishes and yang declines; At noon, it is 1 1 to 13, when the yang is strong and the yin is weak. Motherland medicine believes that noon and noon are the time when yin and yang alternate, and it is also the time when the human body combines yin and yang through qi. A good afternoon nap is good for nourishing yin and strengthening yang. Children are the heaviest time of the day. At this time, rest can nourish yin and get the best sleep effect and quality, which can get twice the result with half the effort. This coincides with the theory that the human body needs to enter a deep sleep state before 23 o'clock. Childhood is also the time when the meridians of traditional Chinese medicine run to the liver and gallbladder, and the time to nourish the liver should be the time to sleep. If you miss this time's sleep because you stay up late, your liver and gallbladder can't get enough rest, which can be manifested as rough skin, dark spots and yellow complexion.

Take a nap at noon (1 1 o'clock ~ 13 o'clock) and rest for about 30 minutes, with a maximum of 1 hour. Even if you can't sleep, be quiet, let your body balance and transition, refresh your mind and replenish energy. Let's look at an example: people living in the tropics and the Mediterranean are less likely to suffer from coronary heart disease than those living in North America and Northern Europe, and the former has the habit of taking a nap! Scientists from NASA found that a 24-minute nap can effectively improve drivers' attention and performance.