A new baby usually deprives each of it's parents around 350-400 hours of sleep in the first year. That is one entire nights sleep per week, per parent.
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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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Studies show that the colder the room you sleep in, the more likely you are to have a bad dream.
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The record for the longest scientifically documented period without sleep is 264.4 hours (eleven days).
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Sea otters hold hands while sleeping so they don’t drift away from each other.
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