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. Of course, limited by the influence of home layout, we don't have to stick to these theories.
Extended data
Scientific research shows that people should sleep with their heads facing north and their feet facing south. This is because the earth itself has a geomagnetic field, and the direction of the geomagnetic field is north-south (South Pole and North Pole). Magnetic field has the property of attracting iron, cobalt and nickel. The human body contains these three elements, especially the blood contains a lot of iron. Choosing the head, north foot and south direction to sleep can conform to the magnetic field lines, make the magnetic field lines pass through the human body smoothly, minimize the interference of geomagnetic field to the human body, and make sleep more sweet.
Chinese medicine also believes that people should sleep with their heads facing north and their feet facing south. The explanation is that with this sleeping orientation, the direction of qi and blood in the human body is consistent with the direction of the earth's magnetic field lines, which is easy to make qi and blood smooth, reduce metabolic rate and reduce energy consumption, and naturally feel refreshed when you wake up.
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