Haha I actually brought this up in my comment to OP, but do you find that you have this clogged nose in hotels or other places?
If not, and you notice it just at home you may be allergic to dust mites.
I bought dust mite bed covers, pillow covers, and spray and applied them after washing my original bed sheets and pillow covers.
Immediately that day I stopped having a clogged nose in bed.
I’d been suffering all my life thinking it was normal to have a clogged nose in bed lol, turns out I had an allergy.
Hmm I bought these and had no problems at all:
UltraBlock Zippered Mattress Protector (Queen) - Waterproof Cover Stops Dust Mite, Bed Bug, Spills, Bedwetting - Hypoallergenic Encasement with Zipper - White https://a.co/d/594j8Rh
Dust Mite and Allergen Proof Pillow Encasing (Cover); Premium Microfiber (Standard Size) https://a.co/d/8NZkbyT
Pricing for both combined being less than $50