Caffeine is a stimulant that can also make you feel more alert and focused, so it provides you the boost that you need when feeling unfocused. A study published in the research journal, Psychopharmacology, aimed to establish that even at a low dose, coffee can keep drivers more alert and awake during prolonged highway driving. One cup of coffee with 80mg of caffeine can be enough to help drivers stay awake behind the wheel.

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