The direction of TCM sleep is closely related to people's health. Health experts believe that spring and summer belong to the sun, and the east earthquake dominates the spring, which can raise the qi of everything, so the head should sleep in the east; Autumn and winter are cloudy, so you should nourish yin and sleep with your head facing west. In addition, health experts of all ages agreed that the north belongs to water and belongs to the yin position in the yin. Sleeping with your head facing north, the yin and cold will harm the yang of the human body and the house of Yuan Shen, so avoid sleeping with your head facing north. It has been proved that the incidence of cerebral thrombosis in the elderly who sleep with their heads facing north and feet facing south is higher than that in other lying positions, which is easy to induce myocardial infarction. Modern western medicine sleeps with its head in the north and its feet in the south. The human body is influenced by the earth's magnetic field anytime and anywhere, and the brain is also disturbed by the magnetic field when sleeping. When people sleep, they take the posture of head north and feet south, so that the magnetic field lines can pass through the human body smoothly and minimize the interference of the earth's magnetic field.