I have complex central sleep apnea without obstruction. At my worst breathing was not great while awake. I was given a vpap machine but couldn't tolerate it. It made me feel worse. I see you have a cpap. With central apnea it's my understanding a B or Vpap is better because it blows the air in gently as well as pulls it out.

My pulmonologist said I would breathe better during the day if I breathed better at night. But since the vpap wasn't a possibility I hoped the reverse would be true also. I found something that has helped me tremendously. I'm not a yoga person but tried it out of desperation to help strengthen my breathing. It's yoga with Maya Fiennes. You can look into it on youtube. I started with 1 minute increments and very slowly worked my way up. It is life changing. I sleep great at night and feel refreshed when I wake and have profoundly more energy throughout the day. My memory and brain fog has improved as well. I plan on buying a dvd for my pulmonary neurologist to try.