Sleep is coveted by those who lack it and a reward for those who enjoy it. Surprisingly, many animals can sleep standing, unlike humans, who prefer comfortable beds.
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Here are some animals that sleep while standing up:
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Giraffe
Giraffes sleep in short bursts while standing to stay alert against predators. Lying down is rare and brief.
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Cow
Cows can doze off standing up, but just like horses, they need to lie down for REM sleep.
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Flamingo
Flamingos often sleep on one leg, conserving body heat and baffling scientists with their perfect balance.
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Horse
Horses use a "stay apparatus" in their legs, allowing them to sleep standing up without collapsing. They do lie down occasionally for deep sleep.
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Camel
Camels nap standing in the scorching desert to stay alert and avoid predators during rest.