For the last 6-8 months (I don't know excactly when it started), my three year old starts sniffling & sneezing between 2 & 6am. His Doc said I have taken all the right steps to control allergies in that room (cleaning constantly w/out chemicals, taken all stuffed animals, air sealed mattress cover, no pets, windows closed, fragrence free detergent, etc., etc.) to no avail. When we stayed at my Moms for a couple nights (without his normal bedding) it still happened. His Pediatrition gave him a prescription for Zyrtec for a couple weeks (if he responds, it's an allergy & I need to find out what it's to, if not, it's a sensitivity to something else). The Zyrtec isn't working. It just doesn't make since, he doesn't sneeze any other time of the day including when he takes his nap (2-3 hrs) in the SAME bed & SAME room. The only thing that brings relief to the episode each night is changing his sheets. Sometimes he goes back to sleep & no more problem for the rest of the night, sometimes in a couple of hours he starts again. We thought maybe it was a sebsitivity to his urine (he still wets at night). But found out he still seems to sniffle & sneeze even when his pants are dry. Every now and again we will go through a night or two where it doesn't happen, but I can find no pattern to why. Please help. My son and I cannot funtion on so little broken sleep!