The record for the longest scientifically documented period without sleep is 264.4 hours (eleven days).
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Cows can sleep standing up, but they can only dream lying down.
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One reason that kittens sleep so much is because a growth hormone is released only during sleep.
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"Dysania" is the state of finding it hard getting up out of bed in the morning.
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Sea otters hold hands while sleeping so they don’t drift away from each other.
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Sleeping on your stomach can induce weirder, scarier, and sexier dreams.
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