The record for the longest scientifically documented period without sleep is 264.4 hours (eleven days).
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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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Bats sleep 18-20 hours per day.
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Cows can sleep standing up, but they can only dream lying down.
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If you hold farts in during the day, they'll just come out when you sleep.
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The average cat sleeps about 2/3 of the day.
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Studies show that the colder the room you sleep in, the more likely you are to have a bad dream.
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