I assume most of you have this problem. You cannot fall asleep unless you can breathe easily through at least one nostril. For me, its my left one. We all know the cause at this point, swollen turbinates.
We've all tried "home remedies", oils, showers, steam, diet, sprays. But eventually, it doesn't work anymore.
Here are the 2 ways I think it can be fixed:

1. nasal stent that patient puts in at night and takes out themselves in the morning.

2. carbon dioxide

Number one is only available in all of Europe and European territories: (including British virgin islands)
it is called the alaxo stent. They also have different sized ones called alaxo lito stent.
here's the official website:
(not allowed to post a link...just google alaxo stent)

I personally believe this is the cure we have all been looking for. I live in the US, though, so I have not been able to try it.
You put it in at night, and it holds your turbinates open all night for full easy breathing.

Number two is a theory I have. I believe the evidence is showing that carbon dioxide constricts blood vessels, thus it will shrink the turbinates when they fill with blood. Most of us have heard of the Buteyko method. It works based on the principle that carbon dioxide buildup will cause the turbinates to shrink.
Anyway, I have read where doctors shoot carbon dioxide gas up people's noses for about 5-7 minutes and it causes the nasal passage to open up for about 4-5 hours.
The only problem with this method is you need access to a tank of carbon dioxide gas. But if you could get one from a food vendor or something and have a tube hooked on it, you could administer CO2 gas in your nasal passage for a little while and it should open it up.

Something I am testing now is just sticking a straw (with rounded edges) in my blocked nasal passage to force the passageway open. What I have found so far, is that even when my left nostril is blocked, when I stuck a straw up it and forced it to open for about 30 seconds and then pulled out the straw, it seemed to trigger the left nasal passage way turbinates to shrink back to normal size.