I think the vast majority of cat owners would consider that not only strange but cruel as well. Cats need quite a bit of room for mental well being, let alone g

I think the vast majority of cat owners would consider that not only strange but cruel as well. Cats need quite a bit of room for mental well being, let alone general health, and locking them in cages at night is definitely harmful. Doing so at night, for a nocturnal animal, is doubly so. Cages are only broken out temporarily for transportation and health reasons.