Early dawn falls on a city street that almost seems abandoned — until you notice a slight motion in the shadows. A lone figure shuffles across the pavement, and soon, he's joined by another, and then another. They mindlessly lurch forward in relentless pursuit of their target: you, the clerk at the coffee shop. This isn't a zombie story, but those unfortunate souls who have to pull themselves out of bed so early? They might still be headed for an early grave.
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Circadian Rhythm and Your Brain's Clock
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Key Facts In This Video
The body's systems follow a circadian rhythm, which is synchronized with the rise and set of the sun. 00:37
Humans are generally the only species who subscribe to a once-a-day sleeping pattern. 02:18
Constant disruptions from our regular sleep patterns can be linked to diabetes, obesity and depression. 02:54
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