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Select seams along the north-south direction, as well as geomagnetic attraction. Sleeping with your head facing south or north is good for your health, because the aorta and great veins are the most important in the human blood circulation system, and their directions are consistent with the direction of your head and feet. When the human body is in the north-south sleeping direction, the direction of aorta and great vein, the direction of human sleeping direction and the direction of magnetic field lines in the north and south of the earth are the same, so people are the easiest to fall asleep and have the highest sleep quality, so the north-south sleeping direction has certain disease prevention and health care functions. The bedside should not face west, because the earth rotates from west to east. If the head is facing west, the blood tends to go straight to the top of the head and sleep is unstable. If you sleep with your head facing east, you will feel a sense of peace.