So how do you stop the duvet falling out?
I have a handmade blanket and sheet in the Summer. Does away with the whole thing. Duvets and blankets in the Winter though.
I suspect the secret is in the construction of the goose down duvets (Mrs S and self). They just stay where they are put!
As for the children .... I do not enquire ~ they are big enough to make their own beds.
EDIT: Occasionally! Otherwise they crawl into whatever they crawled out of in the morning. Harsh? NO! Discipline!!!