I get "whistling" at night from my through/sinuses that drives me batty so I can't sleep. A kind of whistle crunch sort of thing. I have to clear my throat and nose, etc. but that only fixes it for a short while. If you've got congestion of any sort, it's bound to be hard getting air through there? LOL and it's going to be so only the inside of your head hears. Have you tried lying on your back to see if that helps (that helps my interior sounds; one gets all the outside, night sounds too instead of lying on one's ear and just getting inside sounds).