In China, teachers allow children to sleep in class for around 20 minutes to help improve their learning.
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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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One reason that kittens sleep so much is because a growth hormone is released only during sleep.
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Sleeping on your stomach can induce weirder, scarier, and sexier dreams.
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Those who get out of bed by 7am are more likely to be thinner and happier.
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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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If you hold farts in during the day, they'll just come out when you sleep.
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