The record for the longest scientifically documented period without sleep is 264.4 hours (eleven days).
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The strangers in your dreams are actually people that you've seen in real life.
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Dieters who sleep more take off more fat that those who sleep less.
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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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Honeybees never sleep.
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The harder you concentrate on falling asleep, the less likely you are to fall asleep.
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