But is it true that most people's calories are not too dirty and wet? I don't know. But I personally think it may be that foreigners are afraid of pressing their hair, so they wear hats.
But in China, most people probably don't wear this hat when they sleep, but a few people do. Why? Because you may sleep facing the window or with the air conditioner on at night, people may unconsciously turn off the air conditioner or close the window when they are asleep.
So you may catch a cold or have a stroke while sleeping, but most people who wear hats are old people, because after all, the functions of various parts of their bodies have begun to deteriorate, so take care of their bodies as much as possible. In hot summer, they can only take such measures to cool down.
But for most young people, this is not important, and for young people, wearing a hat when sleeping is a ridiculous thing, which is unacceptable to young people, because it will be very hot and strange after all.
But for a newborn child, when he is born, the nurse in the hospital will put a small soft hat on him, which is also because the newborn child may be a little weak, so he will wear it.