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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47% of people have a nightmare at least once a month.
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The human brain is more active during sleep than during the day.
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Cows can sleep standing up, but they can only dream lying down.
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The higher someone’s I.Q. the more likely they are to be sleep deprived.
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