As the old saying goes, a man's life is thinner than paper after three sleeps. What are the three senses? What's the point?

For everyone, sleeping can be said to be a crucial thing. From the medical and physiological point of view, the quality of sleep has a great influence on people's physical and mental health. Scientific research shows that sleep can supplement human energy, enhance resistance, promote normal growth and development of human body, and is also extremely important for protecting people's mental health and maintaining normal psychological activities. It can be seen that the instinct and habit embodied in the long process of biological evolution are also the active skills of human survival and life-saving. As for sleeping, China people have paid special attention to it since ancient times. In Huangdi Neijing, the earliest medical classic in China, the first chapter is about how to arrange sleep in different seasons, and there are many stresses on sleep time, posture and habits, such as "not staying overnight, not being full for ten nights", "not sleeping in summer, not eating ginseng in winter" and "eating ginseng".

So, what are the three senses? What's the point?

I remember when I was a child, every time I wanted to sleep after dinner, my parents ordered me to stop. At that time, I didn't understand that it was easy to get sleepy after meals. Why not get some sleep? In fact, sleeping after meals is indeed an extremely bad habit. Physiologically speaking, the blood in the body will concentrate on delivering energy substances to the stomach after meals. Sleep at this time, the peristalsis of the stomach will slow down, and protein can't digest and absorb it well. Staying in the intestine for a long time will decompose many harmful substances under the action of anaerobic bacteria, which will bring a burden to the liver and kidney. Moreover, sleeping immediately after meals will lead to the redistribution of blood in the body, which will easily lead to insufficient blood supply in the digestive tract and reflux of stomach contents. Long-term repetition can induce gastritis, reflux esophagitis and other diseases, and it is also easy to indigestion and even insufficient blood supply to the brain. In the long run, it will greatly increase the risk of stroke. Besides, the biggest danger is getting fat! Sleep metabolism will slow down, gastrointestinal peristalsis will slow down, and food cannot enter the small intestine for digestion immediately. Food accumulates in the stomach and heat accumulates in the body, which is easy to cause obesity. Therefore, no matter from what point of view, sleeping immediately after meals is harmful to health, and it is best to take a proper walk or sleep after half an hour. For white-collar workers now, it is also a good choice to stand in the office after dinner.

Regular daytime and tunnel, four seasons cycle, alternating day and night, sunrise, sunset and rest, night out. This has been the case for thousands of years. Therefore, it is easy to understand without sleeping backwards, because it is against the normal laws of the human body to reverse black and white. More importantly, some indispensable hormones in the body are only secreted at night. When people sleep at night, the body will secrete melatonin with the change of day and night. Only when the body secretes melatonin normally can the quality of sleep be guaranteed. However, if they sleep during the day, the body will not secrete melatonin, which will not only lead to poor sleep, but also lead to endocrine disorders. In addition, when you sleep at night, your body will detoxify. If it is reversed, your metabolism will be affected, your immunity will decline, and organ aging will accelerate.

There is also a saying that the body is upside down when sleeping. The ancients believed that the north-south sleeping position was more in line with the direction of the earth's magnetic field. In today's society, although there is a metaphysical atmosphere of Feng Shui, it seems that we have similar attention when we decorate our beds at home. Nevertheless, with the development of society, the nature of many people's work today determines that they need to sleep in the dark for a long time, which is bound to be harmful to their health. Some people say that it is no problem to reverse black and white as long as the fixed biological clock is adjusted. From the above, it is obvious that this statement has no scientific basis. A large number of studies show that normal work and rest time is beneficial to people's health, while disrupting the regular work and rest rules and "destroying" the biological clock will cause many irreversible injuries to the human body. Going to bed early and getting up early is good for your health, which is probably understood by everyone, but obviously, not many people can do it.

The ancients practiced this concept very strictly. Confucian classic "Book of Rites" records that when the rooster crows for the first time, both men and women in the family should get up, wash their hands and gargle, dress neatly, put the pillow mat away, sprinkle water to sweep the floor, clean the room, classroom and court, make a good seat and do their own thing. "Zhu Xi's Family Instructions" also said that you should get up at dawn, sweep the court, and be clean inside and out. Have a rest when you feel dizzy. Of course, the ancients were able to form this habit, largely because of backward technology. But then again, many people may have this experience. When they sleep in the afternoon, they often feel sore all over and have a very tired feeling. This is enough to show that staying up late has an impact on the normal operation of the body. To sum up, the old saying that "people sleep for three times and their lives are thinner than paper" sounds exaggerated, but it is also scientifically based, especially in the modern fast-paced life. A good sleep is probably the lowest cost and the most effective way to maintain health at present. Sometimes, the sudden bad state, a good sleep can always solve more than half. Schopenhauer once said that the biggest mistake that human beings can make is to exchange health for something other than the body. For most people, a good sleep is the most important step to keep healthy.