Koalas can sleep for anywhere from 20 to 22 hours a day, spending most of their time curled up in eucalyptus trees. That's about 90% of their day devoted to catching some Zzzs!
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Brown Bats
These little guys are nocturnal, so they sleep during the day. They can rack up an impressive 19.9 hours of sleep per night.
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Sloths
Another contender for the sleep champion title, sloths can sleep up to 20 hours a day. Their slow metabolism and low-energy lifestyle contribute to their lengthy slumber.
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Giant Armadillo
This armadillo species sleeps for a whopping 18-19 hours a day. They are nocturnal animals, so they sleep through most of the day in their burrows.
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Opossums
These North American marsupials can sleep for 18-19 hours a day. They are not picky eaters and have a low metabolism, so they don't need to spend a lot of time searching for food.
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Pythons
These large snakes can sleep for up to 18 hours a day after a big meal. Since they can go long periods between meals, they have a lot of time to dedicate to sleep.
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Tree Shrews
These tiny mammals are surprisingly sleepy, clocking in at 16 hours of sleep a day. Scientists aren't sure exactly why they sleep so much, but it may be related to their high metabolic rate.
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Owl Monkeys
These nocturnal primates sleep for 16-17 hours a day. Their large eyes help them to see well at night, but they spend most of their days tucked away in the trees.