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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Quick naps not only improve your alertness, but they also help in decision making, creativity and sensory perception.
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The higher someone’s I.Q. the more likely they are to be sleep deprived.
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The harder you concentrate on falling asleep, the less likely you are to fall asleep.
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There's a love mattress that is specifically designed for couples who sleep on each other's arms.
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