No that my set-up has settled and my average AHI is 0.4-1.3 every night, I've started exploring more of the finer details, I'm an engineer and very inquisitive. I like to understand things and really optimise systems.
For me EPR = 0 produces a better Deep/REM split, more like 12%/26%. My hyps are higher and AHI is closer to 1.3, so technically worse from an OSA perspective, but better from a sleep structure perspective.
EPR = 3 produces more like 6%/35%. Here my hyps are often zero and AHI is closer to 0.4 average.
These are averages, obviously there's nightly variances but the trend is observable.
Both scenarios are way better than no CPAP.
I do feel better after more deep sleep, so I'm leaning towards no EPR even though the AHI is not as good, and hypopneas happen about 1 per hour.
Has anyone else observed this? Is there a logical reason why it would be the case or am I imagining it.
I'm using Fitbit and Samsung Galaxy Watch to measure sleep stages, I believe them to be about 70% accurate, and quite consistent and so good enough to establish a trend over a week or two.