Bed: slightly above the knee. The bedside is not near the door. The north-south orientation conforms to the geomagnetic attraction and the orientation of aorta and great vein in the blood circulation system, which makes people fall asleep easily and has high sleep quality. The bedside should not face west, and the earth rotates from east to west, which is unstable with blood. The bedside should be against the wall. The beam presses the bed (the air conditioner hangs above the pillow and the lamp hangs directly above the bed), which has a sense of depression and is harmful to physical and mental health. The bed is not in the mirror, so it is easy to be frightened and fidgety in the middle of the night.