Charles Czeisler, a neuroscientist and sleep expert from Harvard Medical School explains: “When the nature of work changed from a schedule built around the sun to an indoor job timed by a clock, humans had to adapt. The widespread use of caffeinated food and drink—in combination with the invention of electric light—allowed people to cope with a work schedule set by the clock, not by daylight or the natural sleep cycle.” In addition, scientific studies have shown that the power boost of caffeine is connected with its interference with adenosine – a chemical in our bodies, which has hypnotic effect and works as a natural sleeping pill. Caffeine actually ceases adenosine and in this way our alertness gets increased and our sleep habits are disrupted. As we all know, there’s no such thing as a free lunch and we pay for this extra wakefulness.
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