One reason that kittens sleep so much is because a growth hormone is released only during sleep.
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Those who get out of bed by 7am are more likely to be thinner and happier.
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If you hold farts in during the day, they'll just come out when you sleep.
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People who sleep late have more mental stamina and can outperform early risers.
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The human brain is more active during sleep than during the day.
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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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