Wow - that is a new one.
Gosh I had never hear of cats totally destroying something like that in one night.
Like others, I would say have lots of toys around.
It's been a while since I had a cat until Gabby showed up about a month ago. Were the pillows made out of feathers? Gabby is obsessed with feathers. I have chickens and Gabby will chase the feathers that the chickens drop. Fortunately I've taught her not to go for the feathers that are still on the chickens- LOL. She'll even find
I think they're really just playing and they're seeing these smallish pillows as "prey".
Gosh they did a job on your pillows.