Nobody is sure why cats sleep so much. Cats evolved from a long line of hunters and predators – and their sleep patterns reflect that. For one thing, they are crepuscular (most active at dawn and dusk), since their prey would also be active at these times.
Whatever the reasons, there's no doubt about it - cats know how to sleep. Although napping varies from cat to cat, and depends on the cat's age and personality, felines spend an average of 13 to 16 hours each day curled up in slumber. Only the opossum and the bat sleep more, napping almost 20 hours a day. If you want an easy, low maintenance pet…the cat is almost certainly the best choice!