My apnea still appears improved in the last 2 to 3 years which coincides with renovating, repainting, air conditioner and carpet replacement. Going to get an air purifier to clean out allergens and see if that improves things even more. We decided it is worth a try.
Now that I am analyzing my results it is clear my apnea has improved from being severe to being mild and whilst in America almost disappeared. I find that astounding.
Wife is a big fan of ResMed Autoset 10. She says it is much quieter.
Thanks guys, I will do a search to see if there are any studies on this stuff. Is still very surprising and any period of time where I effectively had no sleep apnea seems extraordinary.
I suspect I still have it for life, but we are testing out whether doona contributes to the problem. The jury is out.