I wanted to give you some input but you took away all of my input with the things that you have already done. I think that Surferdude's suggestion makes a lot of sense. There may be a sweet spot for above and below which is not so good so if turning the humidifier off causes a problem, I would suggest that you try some intermediate humidity settings too.
Good luck and I will keep thinking about this to see if I can come up with something else.
Thought I'd post my update in case others are struggling: I cut the humidity almost in half last night. I also noticed a pocket of dust/dog hair in behind the unit (Whoops) so I dusted well, although my filter is new. One or both of these changes resulted in success and no coughing last night! Hopefully it keeps up and I can catch back up on missed sleep. Thanks for the suggestions.
WhooHoo..Thanks for the update. I love a success story!
Well glad you got some improvement there. I was going to say before you said changing settings helped...(as a fellow Asthmatic with well controlled asthma and C-pap) What changed 2 months ago?
Also even though cpap seems to bring it on, could be just something aggravated by the c-pap or even night-time air changes...something not asthma like but lung flora and fauna.
Also, you mentioned finding the dog hair, I do hope you don't have the machine on the floor, that is the worst for getting particulate stuff into it so I hear...have you tried one of those special filter thingies they cell at Vendor no 1 (and other's I'm sure) that has additional filter external to the machine? I've considered getting on for extra measure.
It does seem odd that a temp/hose/humidity setting that has always worked, would stop working for you all the sudden.
Have you started using a different scent/brand of soap to clean parts? Might you consider using Control II stuff to be sure nothing is growing in the tubing/hose etc? (That said the control II stuff has a scent apparently and I myself worry that it would bother me as I'm scent sensitive.
Hope you get complete end to the problem!
Thanks so much TheManseHen, for the thoughtful response. I really can't think of any external factors that changed two months ago (we don't even have a real tree at Xmas), I racked by brain all along! It really only occurred with the mask on. I have some endocrine stuff going on with med changes for that and my body has been through a lot (including my hair fall out uuugh), so could be related to that. None the less, the humidity change helped as I'm going on night two with no coughing.
I don't have the machine on the floor- that would be BAD and a recipe for disaster wouldn't it! Its on a dresser thing I have that I rigged an open shelf on.