Is my coffee keeping me up?

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Eight taps. You'll get how much caffeine is still in you when you fall asleep, the latest time for the drink you actually have, and the one change for tonight.

What's usually your last caffeine of the day?

A single espressoAn 8 oz coffeeA big 16 oz coffeeA cup of teaA can of colaAn energy drinkA pre-workout scoopNothing after my morning coffee