2. North-South orientation is the best orientation of bedroom bed. Because the great arteries and veins are the most important in the human blood circulation system, their directions are consistent with those of the human head and feet. When the human body sleeps in the north-south direction, it follows the geomagnetic attraction, and the direction of aorta and vein, and the sleeping direction of the human body are consistent with the direction of the magnetic field lines in the north and south of the earth. At this time, people are the easiest to fall asleep, and their sleep quality is the highest, which is beneficial to their health.