Our kittens were much more interested in the underside of the bed. They disappeared one day. When I finally looked under the bed, suddenly out from the box spring popped the two little upside-down head. They’d found a hole in the fabric, and in they went.
I would have rather they’d frolicked on top of the bed like they do in this video.
And I’ll bet our kittens weren’t the only ones who wanted to get inside the box spring. I don’t see the attraction, myself.