If it fits, they sits. But have you ever wondered why they do this? Well, for one, it helps their anxiety. And when they’re sitting in a box, cats feel like they’re in a protected place where they can observe and hunt without worrying about being attacked. …But there’s another reason cats like boxes so much: Apparently, our houses are too cold. …By curling up in a cardboard box, cats can trap some of their body heat to make up a few of those degrees.