Dr. Jeffrey Shukhman, DO | White Olive Personalized Care | Woodland Hills, CA Most of my patients tell me caffeine does not affect their sleep. Sleep studies prove them wrong every time. This is one of the most common things I hear in practice. And I understand why. You drink coffee in the afternoon, you fall asleep just fine at night, and you wake up feeling more or less the same. The connection seems invisible, so it is easy to assume there is no connection at all. But