In the blood circulation system of human body, aorta and great vein are the most important, and their direction is consistent with the direction of human head and feet. When the human body sleeps in the north-south direction, because the aorta and great veins are also in the north-south direction, and the water molecules are also arranged neatly in the north-south direction, the blood flow with water as the main component is the most smooth and carefree, and its inertia is conducive to reducing the occurrence of thrombosis through capillaries. Therefore, the north-south sleeping direction has certain disease prevention and health care functions.
Foreign scientists, on the other hand, advocate sleeping with head facing east, believing that head facing north often leads to insomnia and discomfort. Salada subrahmanyam, a professor of physiology at Madras Medical College, demonstrated this basic principle. She said: the weak interference of the earth's magnetic field will greatly change the electrical activity in the brain. If you sleep with your head facing north, it will cause great changes in biochemical movement in the human body. The micro-pulse of magnetic field greatly inhibits the electrical activity of the brain, which makes people feel uncomfortable, irritable and irritable. If you sleep with your head facing east, you will feel a sense of peace.