1. Let the whole body relax when sleeping.

2. If it is an electronic watch, there may be radiation, which is not good for the body, especially the brain.

Besides, I don't know if you have noticed that Russian President Vladimir Putin is wearing a watch on his right wrist. It is said that a Chinese doctor told him that some important meridians of men are concentrated on the left wrist, and the watch worn on the left wrist (no matter how expensive) will have a bad influence on the heart and nervous system of men. I'm not talking nonsense, it's true. From this point of view, the body needs adequate rest when sleeping, and wearing a watch will affect the rest of the body, which is of course not good for the body.