The record for the longest scientifically documented period without sleep is 264.4 hours (eleven days).
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Bats sleep 18-20 hours per day.
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"Dysania" is the state of finding it hard getting up out of bed in the morning.
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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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The strangers in your dreams are actually people that you've seen in real life.
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47% of people have a nightmare at least once a month.
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