It does for me if I have it in excess; say, more than 30 ounces of coffee in one morning. If I drink coffee or other caffeine sources too late in the evening an

It does for me if I have it in excess; say, more than 30 ounces of coffee in one morning. If I drink coffee or other caffeine sources too late in the evening and then can't get to sleep when I want to, that's stressful too.