As the name implies, there should be nothing that hinders air circulation in the sleeping or resting place, that is to say, there should be air circulation in the sleeping or resting bedroom or place, which can promote the circulation of breath and help blood circulation. The second statement is a bit imposing; In other words, the place where you sleep or lie down can't be sheltered from the wind, of course, because it is easy to cause rheumatism, colds, or poor qi and blood.