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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A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
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The average person falls asleep in seven minutes.
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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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Honeybees never sleep.
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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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Cows can sleep standing up, but they can only dream lying down.
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