2. The earth is a huge magnetic field, and its magnetic field lines come out from the North Pole and cross the surface of the earth into the South Pole. If you sleep with your head facing east and your feet facing west, just perpendicular to the earth's magnetic field, it is difficult for the human body to reach a new equilibrium state, and you must dissipate a lot of energy to improve your metabolic ability, so you will feel very tired during the day.
3. The law that the sun rises in the east and sets in the west. If you sleep in the east and west, you will be exposed to the sun in the morning, which will affect your sleep quality.