Sun Simiao, a famous doctor in the Tang Dynasty, said in "Thousands of Women: Daolin Nourishes Nature": "Mortals lie down, facing east in spring and summer, and facing west in autumn and winter. "That is to say, the orientation of sleep is in spring and summer, with the head facing east and the feet facing west. In autumn and winter, the head faces west and the feet face east.
From the seasonal point of view, spring and summer belong to yang, autumn and winter belong to yin; Azimuth, the east belongs to Yang, and the west belongs to Yin. The sun be the spirit erupts in spring and summer, converges in autumn and winter, and is full of yin. Therefore, lying with the head facing east in spring and summer conforms to the yang, and lying with the head facing west in autumn and winter conforms to the principle of "nourishing yang in spring and summer and nourishing yin in autumn and winter" in traditional Chinese medicine.
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