The Professional Sleepers Koalas sleep up to 22 hours daily. Only sloths sleep more than these marsupials. Eucalyptus leaves provide very little energy. Koalas must conserve every calorie through rest. They wake only to eat and move. Their brain size shrunk to save energy. Koalas perfected the art of doing absolutely nothing.
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AnimalsMar 22, 2026
The Professional Sleepers
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