I’ve seen pictures of this occurring with other cats, but in all the years that I’ve had pets, I’ve not observed it personally. Certainly, there have been cats who didn’t fit in cat-beds. The bigger beasts can’t always stuff their girth (bulk, size, fatness, etc.) into the spot they’ve chosen for snoozing or simply relaxing. Witness these examples.
And then there are the smaller cats. Tungsten was one, of course. The tiny terror had no trouble curling in comfort in her beloved cat-bed. Cammie, too, is small, and, like her illustrious predecessor, has no difficulty fitting her little frame into a snug bed - usually.
Last night, in the corner of the sitting room where a bed, already heated by a pad from below, is warmed even more by the hot-water pipes by which it is placed, the princess was so comfortable that she slept through some feline sprawl. The picture is dark because I didn’t want to disturb her by switching on near by lamps. But you get the idea of her spillage.
Comfort is comfort, no matter how it’s shaped.