<p>allergy meds can cause dry eye (my eye doctor told me this after i told him i was on allergy meds).</p>
<p>OP- have you considered an allergy to laundry detergent/softeners/dryer sheet perfumes in his pillowcase and sheets? Are there petro-chemicals like Febreze being used in the house? Soaps, shampoos, or cleaning products in the household could be exacerbating his condition.</p>