"Koala (Phascolarctos cinereus) is famous for its sleepy lifestyle due to its low-energy eucalyptus leaf diet and intensive digestion process. Koalas sleep up to 91.67% of their lives. On average, this Australian marsupial sleeps 18-22 hours a day."

The average female lion sleeps 15-18 hours, while the average male African lion (Panthera leo) spends 18-20 hours per day sleeping. Most active from dusk until dawn, this big cat spends its days sleeping in the shade because healthy adult African lions have no natural predators; they can sleep in the open among diurnal animals.

The North American Opossum (Didelphis virginiana) typically spends its days sleeping. When healthy, this northern marsupial sleeps an average of 18 hours per day. Very nomadic, the North American opossum tends to remain active at night, foraging and looking for suitable places to sleep during the day.

"Owl monkeys (Aotus spp.) are the only true monkey genus that is active at night. When inactive, owl monkeys sleep in family groups in tree holes, dense shrubs, or trees covered with climbing plants."

"Three-toed brown throat sloth (Bradypus variegatus) usually sleeps an average of 15-18 hours a day. Although active during the day (diurnal), this species of sloth is very flexible in its activity patterns. Depending on its environment, the nearby predator population, and food availability,"