The record for the longest scientifically documented period without sleep is 264.4 hours (eleven days).
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You forget 90% of your dreams.
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The average person falls asleep in seven minutes.
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A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
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Some people have a "natural alarm clock" allowing them to wake up when they want. This is actually caused by a burst of the stress hormone adrenocorticotropin.
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The strangers in your dreams are actually people that you've seen in real life.
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