I started on CPAP in 2021. Then I was switched to BiPAP (at a different clinic) in very late 2022. I have been on BiPAP since which is better.

The mask, though, stayed the same. And a couple of weeks ago I saw a sleep technician at the clinic for a mask fit. And she told me that the mask I had had all along, for more than 3 years, had set me up for failure. And gave me two alternatives. I have so far used one of them and I like it a lot, but it is not the one she thinks is optimal. That one, a full face mask, I am yet to try.

Several doctors/PAs, one durable medical equipment provider, two types of machines, and... it took 3.5 years to get to a tech at a clinic who actually knows what she is doing. So it turned out that the tech at DME in 2021 did not select a well fitting mask. How was I supposed to figure it out?

The point is, there are many variables in the CPAP therapy and there might be options you have not tried yet and that is why you believe the CPAP does not work. So, in my case, CPAP did not work but BiPAP did, and then it turns out I should be on a different mask. So many variables. Maybe if you keep combining/permuting, ultimately you will find a solution for the therapy to work for sleep apnea?

I am not implying that it will resolve biphasic sleep, though. Just that you need to get to a low AHI.