Claustrophobia is why I use quilts.

I also wear fleece beanies, or an OR down cap. I prefer warmth while being able to move my head independently.

Quilts without straps should be tuck-able, meaning it's wide enough that you can tuck the long edges under you when it's colder and you want the warmth. I made a Ray Way with "draft stopper" - five inches of nylon around the edges that helps you tuck in.