Most animals have a daily pattern of rest and activity. Some animals are more active during the day (diurnal) and some are more active during the night (nocturnal). How much time do animals spend sleeping? Well, it depends on the animal: Species Average Total Sleep Time Average Total Sleep Time (% of 24 hr) (Hours/day) Brown Bat 82.9% 19.9 hr Giant Armadillo 75.4% 18.1 hr North American Opossum 75% 18 hr Python 75% 18 hr Owl Monkey 70.8%