In other words, the benefit tea and coffee drinkers perceive after a brew stems from removing their caffeine withdrawal symptoms, rather than any net gain in alertness.

换句话说，饮用者喜欢茶和咖啡的原因是，它们能消除咖啡因戒断症状，但这些饮料对大脑灵敏度的提高毫无帮助。

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But what makes people feel different after a cup of coffee in the morning?The researchers say that it is because it reverses the fatiguing effects of overnight caffeine withdrawal.

但是为什么人们在清晨一杯咖啡后感觉确实不太一样?研究人员称，原因很可能是这杯咖啡扭转了一夜没有咖啡因供给所带来的“疲惫效应”。

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That's what we did a few hours into Pennsylvania when our caffeine withdrawal headaches started to kick in and our daughter was getting antsy.

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At first I thought it was caffeine withdrawal or maybe seasonal allergies, but the culprit turned out to be the flickering of the fluorescent bulbs.

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Now, imagine block upon block of caffeine withdrawal.

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