I think that I have an allergy or some other permanent sinus condition. It seems that virtually anything, (e.g. a change in the weather), can set my nose running. A year or so ago, I decided to add Benedryl to my maintenance meds. The effect of this, which I didn't notice until it happened about four times, was that every six weeks I would crash. That is, I would sleep for sixteen to twenty hours. Once I stopped the Benedryl, this stopped as well.