Only people with cats will get this

Toxoplasmosis t.gondii I think it's called. It's the parasite that turns normal people into cat ladies. I believe they shit it out and get it under their talons or fangs and then when they playfully scratch/bite the uninfected it's transmitted to the host who goes nuts.

So the point of having a cat is that you have a selfish little fricker whose idea of playing is that the human does whatever the cat wants. Humans find this style of interaction appealing, because it produces small amounts of a neurotransmitter called dopamine. Cats, while small, are very selfish and will punish the human for not allowing them to hog as much of the bed as they wish.

Despite their size, a cat evolved to be able to take up far more space than they would otherwise be able to, much like a snake can eat a meal much larger than their jaws would seem to allow.

This is my explanation.

Humans are nice enough to roll over and let the other person have their space on the bed.

Cats are just like "oh I'm theoretically not a social animal, so I certainly don't know how to do that".