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.