After understanding, Lu Xuan recalled the knowledge points about Wind Evil in his mind deeply, checked the time, and found it was almost twelve o'clock, feeling a bit helpless.

"Sure enough, even though I'm a doctor myself, I still can't change the bad habit of staying up late."

As a Chinese medicine practitioner, he naturally knows the harm of staying up late.

Occasionally one or two days is fine, but if this happens often, the body will naturally break down.

Modern medicine's understanding of staying up late fundamentally differs from traditional Chinese medicine concepts.

The former believes that as long as the sleep time is relatively fixed, there is no need to worry about when to sleep, whereas the latter, traditional Chinese medicine, clearly does not think so.

Chinese medicine emphasizes the doctrine of the correspondence between nature and humans. All things in the universe, including humans, originate from the "Primordial Qi" between heaven and earth. When the weather descends and the earthly Qi ascends, the interaction of heaven and earth Qi results in various natural things, including humans, mountains, rivers, trees, birds, beasts, insects, and fishes.

This thought inherits the same line as Taoism's idea of "existence giving birth to nothingness," "the Tao gives birth to one, one gives birth to two, two gives birth to three, three give birth to all things."

Since humans and all things in nature originate from Primordial Qi, the body's various life activities should be consistent with nature, which is called "correspondence between heaven and humans."

The characteristics of natural objects are "spring generates, summer grows, autumn harvests, and winter stores."

Spring and summer nourish Yang, autumn and winter nourish Yin. Plants sprout in spring, grow most vigorously in summer, bear fruit in autumn, and seeds are stored in winter.

Animals should also be like this: mating and breeding in spring, growing fastest in summer, storing fat in autumn, and hibernating or reducing activity in winter.

Human life in nature should naturally conform to this law.

In the "Inner Scripture of the Yellow Emperor," there are health-preserving requirements corresponding to nature, such as in the "Great Disc on the Four Qi and the Nourishment of the Spirit" it says, "In the three months of spring... sleep late and rise early, take wide strides in the courtyard, and relax your appearance. In the three months of summer… sleep late and rise early, don't fear the sun... letting Qi release as if your favorites lie outside. In the three months of autumn… sleep early and rise early, rise with the rooster, calm your emotions... maintain your spirit... don't exhaust your ambition.

This means that in spring one should rise early and dress loosely; in summer, exercise outdoors and don't fear the sun; in autumn, go to bed early and rise early, keeping emotions calm and contained; in winter, go to bed early and rise late, keep warm, and avoid intense exercise, etc.

In the "Spiritual Pivot Circulation and Health Association", it states, "Qi rises in the Yang and stops in the Yin." This means that during the day the defensive Qi runs through the Yang meridians of the body, leading one to wake up and start various life activities. At night, the defensive Qi runs through the Yin meridians, leading to sleep and cessation of work. This essentially requires people to adapt to the natural change of day and night, rising with the sun and resting with the sunset.

Chinese medicine emphasizes the importance of "Zi Wu" nap.

Chinese medicine believes that midnight and noon are times when Yin and Yang alternate, and also when the meridian Qi "unites with Yin" and "unites with Yang," so a good noon nap is very important.

At noon, the greatest flow of Qi and blood reaches the meridian associated with the heart, where heart meridian is in charge, and its Qi and blood are at their peak. "The heart commands mental clarity, opens into the tongue, and its glow is on the face."

The heart drives the circulation of blood, nurturing the spirit, Qi, and tendons.

Taking a short rest at noon is very beneficial for nourishing the heart, making a person full of energy for the entire afternoon. Moreover, persisting in taking a noon rest for a long time can effectively reduce the incidence of coronary heart disease.

Women, if they maintain a routine of napping, can promote smooth circulation of Qi and blood, giving them a rosy complexion.

Falling asleep at midnight, "Inner Scripture of the Yellow Emperor" says: "The leftover energy of the liver gathers in the gallbladder and forms the essence. The gallbladder is the upright official, and decisions of the five viscera and six hollow organs are taken by it. Qi fortifies the gallbladder, preventing intrusion from evil. If the gallbladder's Qi is weak, one will lack courage, and decision-making will be hindered."

Only when a person falls asleep before midnight can the gallbladder complete its metabolism.

Therefore, those who sleep 1-2 hours before midnight usually wake up with a clear mind and a rosy complexion. On the contrary, those who frequently do not sleep before midnight will have a pale complexion, particularly due to the gallbladder's incapacity to properly metabolize bile leading it to concentrate and crystallize, just like the concentration of salt after seawater evaporation. This can develop into illnesses such as gallstones, and some people may develop "timidity" as a result.

The "Inner Scripture of the Yellow Emperor" says: "The clearer the gallbladder, the clearer the brain." This embodies the same principle.

Moreover, midnight is also the darkest time of the day, and Yang Qi begins to emerge. The "Inner Scripture of the Yellow Emperor" includes a phrase stating "All eleven viscera and bowels draw from the gallbladder."

This means that Yang Qi's emergence relies on the gallbladder. When gallbladder Qi emerges, the whole body's Qi and blood can follow suit. Securing sleep at midnight is pivotal for the day.

At the Chou hour, the liver meridian is most vigorous, and ideally, we should be in a sound sleep state at this time.

So-called "liver stores blood," human thoughts and actions are supported by liver blood. Old blood needs elimination, and new blood needs generation, and this metabolism usually completes when the liver meridian is most vigorous during the Chou hour.

Chinese medicine theory states: "When people lie down, their blood returns to the liver."

If one does not sleep during the Chou hour, the liver will continue outputting energy to support thoughts and actions, leaving it unable to complete metabolism, hence those who do not sleep before Chou hour often present with a gray face, emotional fatigue, eventually becoming irritable, and are prone to liver disease.

During the Yin hour, the lung meridian is most vigorous, making it an excellent opportunity to nourish the lungs.

The "Inner Scripture of the Yellow Emperor" contains the saying: "Lungs rule over the hundred vessels," implying that after the liver's blood renewal during the Chou hour, the fresh blood is supplied to the lungs, which then distribute it throughout the body.

Thus, a person has a rosy complexion and is full of energy in the morning. During the Yin hour, those who are sick show pronounced reactions.

That's why coughing often occurs at this time, facilitating the expulsion of lung waste through coughing.

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