While I may not be that large for a human, I'm definitely multiples of volume larger than a cat. So it's a bit puzzling when I wake up, our of a relatively heavy sleep, to discover that I'm sleeping damn nearly on top of The Boys - backs scrunched under my side, a tail caught under my hip, etc. And when I move they stretch as if it say "what happened? I was comfy!"
This, of course, from the same Boys that can fall asleep on my windowsill, with the gutter for the window frame pressing into them.