The record for the longest scientifically documented period without sleep is 264.4 hours (eleven days).
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The higher someone’s I.Q. the more likely they are to be sleep deprived.
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Cows can sleep standing up, but they can only dream lying down.
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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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In China, teachers allow children to sleep in class for around 20 minutes to help improve their learning.
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47% of people have a nightmare at least once a month.
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