If your congestion started lately, it is good to look around for sources of the allergy. Rhinitis can arise from some things around you, and dust is one such example.
For starters, you can look around your sleeping area for possible allergens which you know you’re allergic to. If it is dust, take a look at your fan if you’re using a fan when you sleep to see if it’s dusty, as well as areas around your room which can trap dust.
Also, try not to point the fan at yourself when you sleep, as it can worsen the rhinitis if the allergic reaction was indeed due to dust. The action of pointing the fan at yourself does cool you more, but the flip side of it is that more dust gets blown at you, which ends up breathed in when you sleep, and that in turn would cause the rhinitis.
Hope this helps.
Anonymous