I'm American, everyone I know has a duvet, they may not use them year round because of the temperature but we have them. In the Summer, even with the AC and fans on a thin quilt is all I can stand.
I don't know to be honest, iI guess the literal translation would be something like a blanket (but not really, it's more like a heavy duvet that we use along with a normal one and we just call it that) in my mother tongue.
Pats pats*
Kisses forehead* sleep well, old man
Leaves some bread by his side* remember to eat when you wake up