1. Metaphysics of Yin and Yang
This is a kind of traditional culture, and it is also related to people's rich imagination. Mirrors can reflect people's faces and human nature. Metaphysics holds that at night, yin flourishes and yang declines, and people's qi will be slightly weak. Moreover, in ancient times, the lights were dim, the mirrors were not clear enough, and there were probably other objects reflected. People thought that it was ghosts, and looking in the mirror at night would be a ghost, and the mirror also took people.
2. Geomantic theory
Geomantic experts believe that mirrors are easy to kill people, and they are regarded as a tool to avoid evil spirits in geomantic omen. The light reflected by mirrors can deter evil spirits and collide with normal people's anger. Geomantic theory is mostly mysterious, but it has some truth. For example, if you put a mirror in front of people in the room, you will inevitably be frightened when you suddenly see someone passing by in the middle of the night, but at night you will be in a relaxed state and be frightened.
3. Actual effect
If you go to bed late at night, it won't have any negative effects if you look in the mirror when you wash your face and brush your teeth. If you watch scary novels, scary movies and other things that make people feel psychologically suggestive, you should avoid looking in the mirror at this time, so as not to be flustered in front of you. People with rich imagination may always be afraid to see abnormal phenomena in the mirror, which will make you nervous and not conducive to sleep and rest at night.