I have never felt the effects of caffeine. I can drink coffee at 10 o'clock at night and promptly fall asleep. Following the suggestion of a caffeine researcher, I once spent a month drinking nothing but decaf, then switched back to a month of fully caffeinated beverages. Again, nothing. It turns out, the coffee experience is not the same for everyone. How we respond to coffee, whether we like the taste and even how it influences our risk for heart attack or hypertension are all largely determin