As the saying goes, there are three treasures of health: three cold, two down, seven full. The so-called “two down”, that is, to sleep well “nap”. So, what is “nap”? “Midday nap” means to fall asleep on time at midnight and noon. Zi time is from 23:00 to 1:00 the next morning, midnight Zi time for the yin and yang assembly, water and fire at the time, known as the “yin”, is the heaviest yin in a day, but also the best time to sleep, Zi time before going to sleep is conducive to the maintenance of yin; noon is from 11:00 to 13:00, but also yin and yang will meet at this time, when the most prevalent yang, known as the “yang”, “yang”. This is also the time when yin and yang meet, when yang energy is at its peak, known as the “Yang”, and napping at this time is conducive to nourishing Yang. Because in accordance with the time rhythm of Chinese medicine, Zi Shi and the winter solstice of the year corresponds to the nature of the yin gas is the most abundant, and the yang gas has just been born and gradually strengthened, and noon with the summer solstice corresponds to the nature of the yang gas is the most abundant, the yin gas is beginning to be born, and the human body and the natural world corresponds to, there will be the same changes. Regardless of the yang and yin, in their infancy are very weak, if we pay attention to protect at this time, then the yin and yang of the qi can be very good development and enhancement, but also can play the role of yang and yin, so the “Yellow Emperor’s Classic of Nei Jing” said: “yang qi end of the bed, yin qi end of the sleep”. A good nap is indeed very important, but also to talk about certain principles. Generally speaking, “Zi time to sleep, lunchtime nap”, that is, the night must be ready to go to bed at about 10:00 pm, Zi time before (11:00 pm) the best to sleep, for people who have to engage in late-night work, rather than stay up to three or four o’clock, it is better to sleep for a while in the time of Zi time, because the efficiency of this period of time is far greater than that of the sleep Other time periods, it can be said that one minute is equal to one hour. Nap is only required at noon (11:00 ~ 13:00) rest 30 minutes can be, because at this time the yang is full of energy, the best efficiency, nap time is too long, not only a waste of valuable time, but also disrupt the body’s biological clock, affecting the night sleep, but nap must sleep, even if you can’t sleep, but also close your eyes to rest and recuperate, in order to facilitate the body’s yin and yang of the normal exchange of Qi. Someone said, my work and rest time can not be adjusted, how to do? In fact, it is very simple, you can try to set the alarm clock in the morning an hour earlier, so that the night will also go to bed an hour earlier, for a long time, work and rest time will be slowly adjusted. If you still can not sleep, you can try to soak your feet in warm water before going to bed, massage the soles of your feet, so as to promote the heart and kidney intersection, both fire and water, to promote sleep; or slow down the rhythm of the whistle, appropriate meditation, walking, lying in bed for a few minutes to do a few minutes of static qigong, watching a slow-paced TV, listen to slow music and other methods, but also the body gradually into the static, because static is born of the yin, yin Sheng sleep, and thus gradually fall asleep. Why does the human body get sick? According to Chinese medicine, the root cause lies in the imbalance of yin and yang, and the occurrence of cancer is no exception. The report of the Academy of Social Sciences pointed out that: the average life expectancy of intellectuals is declining, the phenomenon of “overwork death” is becoming increasingly serious, and 70% of intellectuals are on the verge of “overwork death”. Modern people, especially brain workers, busy daytime work, mental stress, night and used to stay up late for a long time, do not pay attention to go to sleep on time, or too much night life, more than miss the timing of the nap or can not sleep a complete nap, affecting the body’s yin and yang of the normal birth of the body’s qi, the damage to the body’s original health suitable for the internal environment, not only is not conducive to the recovery of physical and mental strength. In the long run, it also puts people in a subhealthy state, decreases immunity, and provides favorable conditions for the production and proliferation of cancer cells, which is very harmful to health. The nap is so important, so life, we must improve the understanding of a good nap, in order to save for their future greater health.