Master, please explain from the perspective of Chinese medicine why you can't sleep at night and you are still in good spirits during the day. Besides, you have a good appetite.

One possibility: yin deficiency. Classic: Yin deficiency is heat. Generally speaking, Yang is lively and divergent. Outside, yin stands for stillness, and it is locked in, just like a wife doesn't let her husband run outside. As far as normal sleep at night is concerned, yang goes into yin, just like a husband coming home; If the yin is weak, you can't control the yang, and if the yang is exhausted, you can't sleep. During the day, yin deficiency can't control yang, and yang also runs out, showing a kind of excitement, but this "qi" is relative, not balanced between yin and yang. Good appetite can also be explained, because yin deficiency and yang hyperactivity are relatively strong, so it shows a state of strong digestive function, and it is also a morbid state of eliminating hunger and getting hungry soon after eating.