For me it happens mostly when I lay down. I know to sleep propped up and on my back helps. I tend to sleep sideways and wake up on my back. It doesn’t always happen but sometimes it does and it’s annoying when it does. Like now I work up and blocked. I do put vaporub around my nose and I find that helps.

ENT told me it’s my turbinates swelling. I have a little ear camera I use to look at it and this has made me think laser turbinate reduction may not work bc it changes. One moment it’s super swollen like a balloon but then they shrink on their own back to normal. It’s usually mostly one side but then it switches to the other side instead.