One reason that kittens sleep so much is because a growth hormone is released only during sleep.
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44% of kids watch television before they go to sleep.
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The human brain is more active during sleep than during the day.
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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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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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