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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"Dysania" is the state of finding it hard getting up out of bed in the morning.
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Cows can sleep standing up, but they can only dream lying down.
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The strangers in your dreams are actually people that you've seen in real life.
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Dieters who sleep more take off more fat that those who sleep less.
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