In terms of the orientation of sleep, some ancient health experts also advocated lying in the east all the year round, thinking that the sun's qi rises and lies at the head of the four seasons in order to conform to the sun's qi. In ancient times, some doctors and health experts believed that the direction of lying position should change with the seasons, with the change of spring, summer, autumn and winter, and the head should face east, south, west and north, which is also in line with the laws of nature and has certain scientific reasons. However, from the perspective of many health practitioners, it is best to take an east-west position. Western health care view holds that the position of the bed should be north-south, with the head facing north and feet facing south when sleeping. Because the earth itself has a geomagnetic field, and the direction of the geomagnetic field is north-south (South Pole and North Pole), people are small magnetic fields with magnetism and polarity. Magnetic field has the property of attracting iron, cobalt and nickel, which are contained in human body, especially in blood. Therefore, east-west sleep will change the distribution of blood in the body, especially in the brain, which will cause insomnia or dreaminess and affect the quality of sleep ... The magnetic field lines of the earth start from the North Pole and extend through the ground to the South Pole. Therefore, people's sleep conforms to the magnetic field lines in the south direction of the head, north and feet, and strengthening bioelectricity is beneficial to blood flow.