Why Does Coffee Sometimes Make Me Tired?

Caffeine, the main active ingredient in coffee, has a well-justified reputation for being an energy booster. But caffeine is also a drug, which means that it can affect each of us differently, depending on our consumption habits and our genes.

“The paradox of caffeine is that in the short term, it helps with attention and alertness. It helps with some cognitive tasks, and it helps with energy levels,” said Mark Stein, a professor in the Department of Psychiatry and Behavioral Sciences at the University of Washington, who has studied the impact of caffeine on people with A.D.H.D. “But the

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