Maybe we should exchange the phrase "cat nap" for "bat nap." Brown bats sleep an average of 20 hours per day, more than any other animal.
Sloths have a reputation for being lazy and sleepy, but they are relatively active compared to bats and get approximately 9-10 hours of sleep a day. Giant armadillos, North American possums and pythons also need a lot of sleep, clocking in an average of 18 hours of sleep each.
It has been rumored that lions sleep 20 hours a day, but research shows that to be untrue. Both house cats and wild cats take sporadic naps through the day and night, sleeping approximately 14 hours a day.