The Yellow Emperor’s Classic of Internal Medicine believes that “the middle of the night is Yin Long, and after the middle of the night is the decline of Yin”. The “midnight” here refers to the hour of the son, that is, from 23:00 to 1:00 in the evening. It means that the Zi Zi hour is the heaviest moment of Yin, after which Yin declines and Yang grows. Yin is the main quiet, Yang active, with this, the human body needs the most quiet at this moment, we are most appropriate to sleep peacefully. Chinese medicine is particularly concerned about sleeping “Zi Zi sleep”, because at Zi Zi the qi and blood flow into the bile meridian, Yang Qi begins to develop, and sleep becomes the best way to protect Yang Qi. Yang energy is the essence of life, “Yang is strong, life, Yang is weak, death”. If you stay up late at this time, you will consume the yang energy that has just developed, which is extremely bad for the human body. The first thing you need to do is to sleep at the hour of the zipper to nourish the vitality, and from the point of view of the internal organs, it is also to nourish the bile of the person. “All 11 organs depend on the gall bladder”, if the gall bladder does not develop, it will affect the function of other organs. If the vitality is not nourished, the whole person will be drowsy. Therefore, it is very important from the perspective of health care to get a good sleep at the time of the son. Ziji is equivalent to the winter solstice of the year, sleep is the most responsive to the time of day A day is a small four seasons, Ziji is equivalent to the four seasons of the “winter solstice”. The winter solstice is the day of the Yang, at this time, we must let the human body collect and follow the changes of the four seasons, only in this way can the heaven and man unite and live a long and healthy life. Now we all know that we should go to bed before 23:00, but very few people can do it. In the end, or for 23:00 before the meaning of sleep is not well understood, do not understand after this point in time to sleep in the end how much damage to the body. So after this time still game for fun, stay up late and work overtime people are not a few. In fact, sleep before 23:00 this statement is not very strict, to be precise, should be at 23:00 into a mature sleep. In other words, it should be before 23:00, according to the personal sleep situation, discretionary choice. For example, you are very easy to fall asleep, fall asleep in three minutes, then you can go to bed at 22:55 or so. If you are very difficult to fall asleep, half an hour to fall asleep, then you have to go to bed at 22:30, in short, have to enter a relatively deep sleep at 23:00. Why such a strict limit? The key is to respond to the time of day, echoing heaven and earth, which is what Chinese medicine calls the unity of heaven and man. We all know that there are four seasons in a year, but do not know that in fact, a day is also a small four seasons, “Huangdi Nei Jing – Shun Qi a day is divided into four times” said: “to a day is divided into four times, the morning is spring, the middle of the day for the summer, the day into the autumn, midnight for the winter.” One day is the concentration of a year, 23:00 pm to 3:00 am is equivalent to the “winter” of the year. In winter, heaven and earth are asleep, animals hibernate, plants wither, if people do not rest, it is equivalent to doing “tug-of-war” with heaven and earth, the result of going against the sky is bound to be a great physical suffering. Ziji is equivalent to the “winter solstice” of the 24 solar terms. The winter solstice is the time when yin reaches a peak and yang begins to develop, and the body begins to enter a new cycle. Many people who have not yet slept will feel particularly energetic at this time, but in fact it is not that they are particularly energetic, but the expression of the growth of Yang Qi. If you don’t sleep at this time, Yang Qi will not be able to develop, and if Yang Qi can’t develop, Yin Qi will not be able to collect, and the only thing that can come from the imbalance of Yin and Yang is that the body is full of diseases, and it is hard to get peace. Therefore, in order to get healthy, you should put yourself away before this, calm down and prepare to sleep, so that you can adapt to the natural law of autumn harvest and winter collection. “Man is also in tune with heaven and earth, and corresponds to the sun and the moon.” This phrase from the Spiritual Pivot briefly summarizes the relationship between man and heaven and earth, that is, the human body is a small universe, and only by adapting to the big universe of heaven and earth and nature and following the trend can we obtain health and live with the sun and the moon. Sleep to nourish Yang, Yang Qi is the fundamental protection of all things grow by the sun, the human body and natural things, the need for Yang warmth, only Yang Qi is sufficient, blood circulation can be normal, the internal organs to maintain a balanced state of Yin and Yang secret, the body can also be a hundred diseases. An important feature of sleeping at the time of the zipper is to follow the time of day and let the yang energy develop smoothly. Many people may still not understand what Yang Qi is and what important effect it has on the body. In the Yellow Emperor’s Classic of Internal Medicine – The Treatise on Anger and the Tongtian, it is said, “Yang Qi is like the sky and the sun, if you lose its place, you will lose your life and not manifest.” If the human body lacks Yang Qi, it is just like the natural creatures lacking the sunlight, and will die or lose longevity. People often say: everything grows by the sun. In fact, the human body is also the same, relying on the warmth of Yang Qi protection. Yang Qi is called “Wei Qi” in Chinese medicine terminology, that is, the guardian of the body. Insufficient yang qi, manifested in the internal organs is a kidney yang deficiency, spleen yang deficiency, the body’s qi and blood stagnation, the ability to transport food is not enough, the whole body in a dark and humid environment, dampness and turbidity, disease, and even personality will become “internal sorrow and dark hatred”, so the most important thing for generations of doctors is to mobilize the body’s yang qi. The modern way of life, the heaviest damage is Yang, such as blowing air conditioning, eating cold drinks, sitting still, etc., are extremely harmful habits of Yang. The famous old Chinese doctor Li Ke said, in his clinical experience, Yin deficiency of people, not one or two hundred cases, the vast majority are Yang deficiency. This shows how seriously the modern lifestyle hurts yang energy.