The record for the longest scientifically documented period without sleep is 264.4 hours (eleven days).
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A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
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Honeybees never sleep.
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In China, teachers allow children to sleep in class for around 20 minutes to help improve their learning.
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Bats sleep 18-20 hours per day.
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There's a love mattress that is specifically designed for couples who sleep on each other's arms.
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People who sleep late have more mental stamina and can outperform early risers.
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Cows can sleep standing up, but they can only dream lying down.
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