One.... or two... it depends on how many it takes for me to make a "nest"
When I sleep, all you can see is the top of my head. I roll myself up in the duvet like a caterpillar gone mad, tuck the end under my feet and screw myself up in a ball so that pretty much only my nose sticks out so that I can breathe. I can't sleep unless I*m warm and somewhere soft. I'm a cat at heart.