Hello girls! I'm curious, how do you cover a child for sleep in winter…

Hello girls! I'm curious, how do you cover a child for sleep in winter? It's cold at home, I thought about buying a sleeping bag for kids but at night he turns over and it will be inconvenient, I'm afraid of a blanket because suddenly his head could be covered and it would be hard to breathe. Should we just simply warm him up at night? Or is there something else we can do?