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.
15
You can reschedule your sleeping pattern by not eating 12-16 hours before you want to be awake. Upon eating after this time period, your internal clock will reset to a new day, with the time of your first meal being interpreted as "morning".
11
Quick naps not only improve your alertness, but they also help in decision making, creativity and sensory perception.
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Blue light fends off drowsiness in the middle of the night, which could be useful to people who work at night.
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Studies show that the colder the room you sleep in, the more likely you are to have a bad dream.
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Honeybees never sleep.
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