One reason that kittens sleep so much is because a growth hormone is released only during sleep.
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The strangers in your dreams are actually people that you've seen in real life.
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A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
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The higher someone’s I.Q. the more likely they are to be sleep deprived.
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Sleeping on your stomach can induce weirder, scarier, and sexier dreams.
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The record for the longest scientifically documented period without sleep is 264.4 hours (eleven days).
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The harder you concentrate on falling asleep, the less likely you are to fall asleep.
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