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I've been feeling a little drowsy and out of it for the past week, no matter how much sleep and exercise I do. What gives?

A friend and I were talking, and perhaps its a low level allergy reaction. Maybe most people don't get the watery eyes, stuffed up nose, etc. but perhaps many of us are sensitive on a more subtle level.

I've popped a Claritin each of the past two days and have felt much better. That certainly doesn't make for a medical case study, but its worth a try.