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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Sleeping on your stomach can induce weirder, scarier, and sexier dreams.
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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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People who sleep late have more mental stamina and can outperform early risers.
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The harder you concentrate on falling asleep, the less likely you are to fall asleep.
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