Ray has a rectangular cushioned bed in the end of our kitchen which he uses most nights and sometimes during the day. He could curl up on it quite easily, if he wanted to, but he often chooses not to. Instead he stretches out to his full length which dictates part of him is off the bed.
I shake my head whenever I see him there with his head on the hardwood floor!
He also has a circular bed, and it took him a few weeks to master the art of curling up in the middle of it. Invariably some part of him would be on the floor. While he has now mastered the circular bed, there are times when he simply will not curl up on it!
He has a cushioned bed fitted into his den (crate). Again he tends to stretch out such that his head is often resting across the steel bar that forms the bottom frame of the entrance.
Of course he is not averse to a real bed occasionally!
When he is laying down but awake, it is interesting to see that he tracks every movement with his eyes only. He rarely moves his head! His resting positions may well therefore be a result of answers to “What can I see from here? “, “Can I get up fast if necessary? or “Is their/there (both could apply!) food close by? He really is an interesting “guy”!
Refer “Let Sleeping Dogs …” Parts I & II