SLEEPYHEADS IN ANIMAL KINGDOM 

Although humans generally need about 7-9 hours of sleep each day, certain animals elevate "napping" to an entirely different degree. These animals devote a considerable part of their existence to sleep, which is connected to their habitats and ways of life.

Here are some animals who sleep the longest. 

Koalas can sleep for up to 22 hours a day, conserving energy due to their low-calorie eucalyptus leaf diet.

Brown bats emerge at night but are only active for 4 hours. They can sleep for 20 hours upside down due to lack of food. 

Giant armadillos sleep 18-19 hours daily, possibly due to their solitary nature and lifestyle.

Owl monkeys are nocturnal and can sleep about 17 hours daily.  They have large brown eyes for night vision, and are found in Central and South American forests.

Tigers can rest for 18-19 each day, as solitary animals they need to save energy for their hunting activities.

These small, striped rodents, predominantly in North America can sleep for 15 hours daily, likely because they nest in hidden places and don't need to remain vigilant.

Pythons sleep for 18 hours daily year-round. Pythons hibernate themselves in winter as they remain inactive and asleep.

Australian platypus sleeps about 14 hours, spending more time in REM sleep than other mammals, likely due to diet.