The Koala is who sleeps for 90% of the day.
Koalas sleep for around 20 hours to 22 hours a day which is nearly all the day.
Koalas sleep for 90% of the day because they have low energy and a low energy eucalyptus diet requires extensive digestion, which makes the Koala the top sleepy animal.
Although sloths also sleep a good portion of the day as sloths sleep an average of 20 hours a day.
Koalas eat eucalyptus leaves which also offer minimal nutrition and are also toxic and require a long, energy intensive digestive process and sleeping for 22 hours a day helps the sloth conserve vital energy that is needed for digesting their difficult to digest and process food.
The animal that sleeps for 7 hours is captive elephants.
Captive elephants are known to sleep for around 7 hours a day, which is unlike the wild elephants who sleep around 2 hours in short bursts due to survival needs.
Other animals like opossums sleep around 6 hours and some types of insects or deep hibernators can even sleep for months or years.
Although 7 hours of sleep is mainly done by elephants that are in captivity.
Captive elephants can get more sleep than wild elephants as they don't have to worry about survival like wild elephants do.
Captive elephants also tend to sleep for the 7 hours a day in shorter and standing naps.
Opossums sleep roughly 6 hours but also stay busy when awake.
Animals that sleep even longer are Koalas which sleep up to 22 hours a day.
Sloths sleep around 20 hours a day.
Brown bats sleep around 20 hours a day.
And some animals that sleep less are horses who sleep around 3 hours.
And Great Frigatebirds sleep as little as 40 minutes and in tiny naps.