Cats snooze about 15 hours a day on average, but it's not because they're lazy. Despite being so sweet and domestic, house cats have retained a sleep cycle similar to that of their counterparts in the wild.
"Cats have the physiology of a predator, meaning that they're hardwired to give chase and hunt -mainly at night," writes PetMD. "Large cats such as lions have a similar pattern of sleeping during the day and hunting at night. Although they have been domesticated for the most part, housecats still retain that wild streak."