I asked my dog (the little one in my neck on my picture) and she said sticking your head out of a car window at 100km/h is the best! Haven't noticed any breathing problems during sleep either, so it must be working.
If this isn't appropriate, please forgive me. Currently hypo and I tend to find myself a bit too funny when having low bg. I honestly don't know anything about sleep apneu , so I probably shouldn't be joking about it.
I have never used cpap so don't know whether it's true or not but someone once told me it was like sticking your head out of a car window going at 70mph! I've never tried that either but it doesn't sound too nice!