I stopped using a CPAP machine to sleep a few weeks ago. After 17 years.
My O2 levels are now solid in the 90’s. And I have to admit losing 80 pounds was key. Walking ~3 miles/day at [a moderate] elevated respiration rate helps, too.
My sleep doc told me I could stop. That I had corrected everything causing my sleep apnea as far as he could determine.
Frankly, I’ve been very happy with the solid sleep I’ve enjoyed over the years with a couple of different CPAP machines over time. Wore the first one out in a decade.
Took a year before I tried this. Love the change.