Koalas are known to sleep upto 20 hours a day, owing to their low energy due to eucalyptus leaves diet.
Sloth sleep can average around 15 hours a day. Their low metabolic rate contributes to their need for extensive rest.
Armadillos are known to sleep for 16 hours a day. They are noturnal, hence they sleep through most of the day.
Bats are also nocturnal and hence sleep through day. Brown bats can sleep upto almost 20 hours.
Pythons can sleep for about 18 hours a day, especially after a heavy meal.
They can sleep up 18 hours a day as they are mostly active during the night.
They can sleep up upto around 12 hours and are known for their lazy behavior.