What is happening when sinus pressure slowly builds in one nostril when laying down?

Question

Conversely, what is happening when you flip over and the pressure slowly releases (sometimes with a “pop”), and then you feel the other side fill up? However, you never have mucus build up that can be blown out.

In: 22

Answer 1

What if one is always restricted, I swear my left is never getting enough air. No mucus or anything