Why is it not good to face west and east?

Hello, not good. The earth is a huge magnetic field, centered on the north and south poles, emitting a powerful magnetic force.

People sleep north and south, just along the direction of the geomagnetic field, and sleep well.

Sleeping in the east-west direction, although there is no special induction, has a certain impact on human cells and physiological functions, and even feels restless and difficult to fall asleep.