The record for the longest scientifically documented period without sleep is 264.4 hours (eleven days).
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Bats sleep 18-20 hours per day.
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A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
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The harder you concentrate on falling asleep, the less likely you are to fall asleep.
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Termites work 24 hours per day and they do not sleep.
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44% of kids watch television before they go to sleep.
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Sea otters hold hands while sleeping so they don’t drift away from each other.
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