Why Do Cats Like Boxes?
Sleeping or hiding in a small, confined box alleviates stress in our kitties' lives. Cats can be easily stressed by minor changes in their environment, so providing them with a box, cat tree, or soft bed is important.
Studies conducted in shelter environments have proved that cats provided with a hiding box are able to cope faster in their new environment. Now go back to watching all those videos of cats trying to fit in the smallest boxes.