The correct sleeping direction is to sleep with your head facing south and your feet facing north. Because of this kind of sleep, the human magnetic field can be in the same direction as the earth's magnetic field lines. If something sleeps, which is perpendicular to the direction of geomagnetic field lines, the magnetic field lines of the human body will be disturbed, resulting in poor sleep quality. After a sleep, I still feel very tired.
Look at the buildings in China. Most houses face south, which is also an example of people sleeping in the north and south.
The most taboo is to sleep with your head facing west, because it will be disturbed by magnetic field lines. Another point is that the west is a cold and cloudy place, which is easy to cause physical weakness.