Huangdi Neijing, an ancient book of traditional Chinese medicine, said: "Yang exhaustion leads to lying, while Yin exhaustion leads to lying." . 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 body's menstrual qi "closes yin" and "closes yang". A good nap is good for nourishing yin and 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. At noon (11:00 ~13: 00), take a nap at "Heyang" time and rest for about 30 minutes, at most1hour. Even if you can't sleep, you should "calm down" to balance your body, 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. Ma Si, the author of Vigorous Sleep, pointed out that a nap can effectively help people concentrate and make the right decisions. Although nap is not the main sleep, and the time is short, but its role can not be ignored. To sum up, taking a nap has at least the following advantages: ╋ After taking a nap, the brain is better used, more flexible, more responsive, more energetic and more excited. Taking a nap can relieve tension and effectively help people maintain psychological balance, especially for people who are nervous at work every day. According to Dr Cartier's theory, daily activities can make people secrete oxides that lead to cell aging. Therefore, people can get better maintenance, delay aging and relieve tension during a nap. Taking a nap can relieve the cardiovascular system, reduce the risk of myocardial infarction and "recharge" health. People who take a nap have a lower incidence of coronary heart disease than those who don't take a nap. And according to a recent survey, taking a nap for half an hour every day can reduce the possibility of heart disease by 30%, because during the rest period, heart consumption and arterial pressure are reduced. According to Professor Chiofalo's theory, there are two kinds of people who especially need a nap. One is to sleep at night, the other is to go to bed early and get up early. However, experts suggest that people need to get into the habit of taking a nap. For people who don't take a nap every day, it is not advisable to take a nap occasionally, because it will affect sleeping at night. In addition, a nap is not advisable for people who often suffer from insomnia, because they can't sleep at night after a nap. Disclaimer: The above content comes from the Internet, and the copyright belongs to the original author. If there is any infringement of your original copyright, please let us know and we will delete the relevant content as soon as possible.