From a scientific point of view, the rays produced by the mirror will interfere with people's brain activities, especially when sleeping, if the bed is facing the mirror, it will cause neurasthenia and nightmares, and it will also make people enter a nightmare state, that is, they know that they are dreaming, but they can't wake up in their dreams. I wonder if you have any experience in this field.
A Dream of Red Mansions describes Granny Liu entering the Grand View Garden and sleeping in front of the mirror in Baoyu's room.
In short, the mirror is a big taboo for the bed. It is best to move it. If it is inconvenient to move, cover it with something. As for the idea of inviting ghosts, it is superstition ~ ~ ~