Do you know Cats average 17 to 18 hours of sleep each day? or about two-thirds of their entire lives sleeping or having pleasant day time naps.
How many hours they sleep depends on their age. Kittens are very fast growing so they tend to require more sleep than most adult cats, apparently. The amount of sleep a cat gets also depends on how safe they feel. If they happened to be sharing a home with a cat pursuing dog, they would spend more time awake and weary.
Cats sleep time also depends on what the weather is doing. If it is cold wet day, they prefer to snuggle up in a nice warm place (like their mum and dads doona cover), however if it is a warm sunny day, they like to be out and about exploring, or searching for somewhere in the warm weather to have a catnap.