One reason that kittens sleep so much is because a growth hormone is released only during sleep.
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Dieters who sleep more take off more fat that those who sleep less.
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Quick naps not only improve your alertness, but they also help in decision making, creativity and sensory perception.
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Bats sleep 18-20 hours per day.
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A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
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Sea otters hold hands while sleeping so they don’t drift away from each other.
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A new parent will lose about 1055.6 hours of sleep in the first year of their child's life - almost 44 days!
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