Why Do Cats Sleep All Day?

Humans are primarily diurnal, meaning they're mostly awake during the day. Creatures like owls and bats are famously nocturnal. Corpuscular animals include deer, rabbits and mice. Cats also kind of fringe between being corpuscular and notnd straight on nocturnal,. There are even creatures that are active only at dawn. And then lastly, there are animals that are only active around dusk. These are called vespertine animals, from the latin word vesper, which means evening. For example, lions sleep about 16 hours a day, but antelopes only get seven.