Sleeping on the job is acceptable in Japan. It is viewed as exhaustion from working hard. Some people fake it to look committed to their job.
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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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Sea otters hold hands while sleeping so they don’t drift away from each other.
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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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A hippo sleeping underwater automatically rises to the surface every ~4 minutes and breathes without waking.
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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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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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