Whenever we were away for a show, the dogs became bed-dogs. Deedles used to come right under the duvet and snuggle up between my legs. Which was fine until he did want to surface, either for air or because he was too hot. He would sit up, stretch, and wiggle his shoulders until the duvet came right off and fell on the floor at the foot of the bed.
Which left ME cold and needing to get out and recover the duvet. . .
Deedles would lie on top for a while, then burrow under again and repeat the performance.
Don't worry about it !