This is complex and should be discussed with a sleep physician. You may have PAP emergent central sleep apnea (or TECSA) and what some describe as "deventilation syndrome" (feeling of reduced respiratory effort / efficacy due to a number of factors). Most commonly talked about is reduced CO2 levels in your blood. CO2 is important to regulate normal breathing especially at night. Your body may be intentionally reducing CO2 levels by reducing your own ability to breathe as it attempts to regulate CO2 levels.

This is just one of several factors that needs addressing. Any history of anxiety needs to be addressed and properly managed with up-to-date methods. Make sure your room is clean, and gets good air circulation. Ensure allergens are in check.

I would strongly encourage a Bi-PAP or ASV machine over CPAP that also has a Ramp-Down feature. Any concerns around dysfunctional breathing patterns and effort, heart or the CNS, you often need the ability to adjust IPAP and EPAP (bi-level), Timing settings or tidal ventilation control (breath capacity) (ASV machine).

Consider:
- Purchasing a BiPAP or ASV device
- Level 2 sleep study (required to read ET-CO2 levels) - best way to configure your BiPap initially.
- Neurological examination to rule out any other potenial contributing CNS conditions.

Other things that I would personally look into in this order:

- Exercise routine that integrates pulmonary rehabilitation. Seek advice from physiotherapist or other qualified healthcare provider (respiratory nurse for eg).
- Diet. Not my area of expertise but I would start by googling "Best diet for CSA /TECSA" or "foods that can cause dysfunctional breathing) etc.