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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Quick naps not only improve your alertness, but they also help in decision making, creativity and sensory perception.
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Some people have a "natural alarm clock" allowing them to wake up when they want. This is actually caused by a burst of the stress hormone adrenocorticotropin.
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Lack of water is the #1 trigger of daytime fatigue.
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