What does Chinese medicine mean by yin exuberance and qi decline?

Man can be compared to the sun, while Yin can be compared to the sea. The sea can adjust the temperature. When the sun shines strongly, the sea water absorbs heat, so that the temperature will not be too hot. When the sun is weak, the sea gives off heat, so that the temperature will not be too cold. If there is no sea and only a few small ponds, this regulation function will be weak, so it is hot in summer and cold in winter. Why do you always dream at night, because people sleep when the sun is weak? Now Yang Can can't come back because of yin deficiency, so I dream more. Why do you always feel very tired during the day? There is less yang stored in the yin, so there is less yang that can be emitted. Your situation is caused by staying up late for a long time. Deficiency of both yin and yang is mainly yin deficiency, but its essence is qi deficiency. In the long run, you will lose sleep and so on. You should improve your lifestyle as soon as possible.