Adapting to ASV

I have mixed sleep apnea and was prescribed an ASV machine after not tolerating CPAP or BiPAP. I’ve been using the ASV for nine nights. So far, I’m able to sleep with it for about four hours per night.

According to the ResMed data, my central apneas and hypopneas appear to be well controlled (under five events per hour). However, I feel absolutely awful—like a constant, severe jet lag that never goes away. I’m extremely fatigued during the day.

What surprises me is that even though the apnea seems to be controlled (at least based on the machine’s data), I feel significantly worse than before starting therapy. Prior to treatment, I didn’t feel bad at all. I pursued treatment primarily to reduce the risk of recurrence of atrial fibrillation following a cardiac ablation last year.

Is this kind of response normal early on with ASV? How long does it typically take to adjust, and is it reasonable to expect that I will feel better with time?
I understand it’s still early—less than nine days—but I would really appreciate any input or shared experiences.
Thank you.

As someone who struggled too with an ASV, mine did take a long time but man it was so worth it. The best thing you can do is to wear it while you are awake. So if you are reading,watching, on your phone/laptop you can just have it on. I think this makes your brain tolerate it and adjust to the ASV much quicker