Why is the Circadian rhythm closely related to the changes of yin and yang in traditional Chinese medicine?

Why is the Circadian rhythm closely related to the changes of yin and yang in traditional Chinese medicine?

Wen | Wu SirEditor | Eucommia ulmoidesInsomnia, also known as insomnia, refers to a subjective experience of feeling dissatisfied with the duration and quality of sleep despite appropriate sleep opportunities and environment, and affecting daytime social function.With the rapid development of modern society, fast-paced, high-intensity, irregular living habits directly or indirectly lead to the incidence rate of insomnia increasing year by year...