Caffeine can linger in your system for 10 or more hours, which can impact sleep. Double-shot lattes and cold brews have ...
We tested the levels of caffeine and contaminants in brews from Dunkin', Folgers, Starbucks, and more. Some will wake you up—or keep you up—more than others. By Janet Lee Whether you drink coffee to ...
If you're feeling anxious and having trouble sleeping, you may be taking in too much caffeine, or you may be a slow metabolizer.
Ashley Wong, PharmD, is an experienced pharmacist and medical writer who translates medical and drug information into easily digestible language. Caffeine is a natural stimulant most commonly found in ...