Those who get out of bed by 7am are more likely to be thinner and happier.
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The human brain is more active during sleep than during the day.
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In China, teachers allow children to sleep in class for around 20 minutes to help improve their learning.
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Sea otters hold hands while sleeping so they don’t drift away from each other.
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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 record for the longest scientifically documented period without sleep is 264.4 hours (eleven days).
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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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