First, cats are much more fragile than people, and being accidentally crushed may be fatal; Secondly, people and cats have many diseases that can be cross-infected, which is not very good for people and cats; Thirdly, cats are relatively independent animals after all, and it is more likely that they will bite and catch people if they are unhappy (anyway, my family will fall asleep, and I am afraid I will be blind and I don't know when to catch them).