Yeah, but it's cold and usually damp, and there's a faucet that'll bump 'em in the noggin if they aren't careful.
But then, Halvah makes a lot of odd sleeping place choices. Like, for example, she doesn't really like to just sleep on the carpet, but if a paper bag gets left out, she'll sleep on that quite happily. Even if it's one too small for her to fit on it entirely. Looks silly.
She's just trying out different sleeping options.
Mine do that all the time. Anything on the floor that can be curled up on is a bed even if it is really too small to be actually curled up on.