Dreamwear porting and rebreathing

[Boodmaster]

It’s been a few years of Resmed only, f20, n20, f30 and 40. When I first started my ASV back in 2017 I noticed dreamwear (nasal, full face pillows) all made me wake up about 90 minutes after falling asleep dizzy. I mean really out of it. I always chalked it up to being new, panicking, etc.

My pressures have remained constant for about 5 years, ahi is always <1, basically no leaks. So after all these years I tried my old dreamware setup with the f40 style full face mask, the one that goes under the nose but over the mouth.  It’s my favorite by far comfortably, I like it better than the f30 and f40, it keeps my nose open without pinching.  Same deal, about 90-120 minutes later, I woke up, dizzy and out of it. Hasn’t happened in years.  I’m very attuned to myself. I’m all but convinced there’s not enough porting / exhale flow for me, and I’m dealing with rebreathing. Never on resmed stuff which is “louder”, I can assume more air is porting. Any thoughts?

[40plus]

I have obstructions in my nose and am awaiting operation septoplasty and turbinate reduction.

I have the same issue as you describe but i usually feel it as tingling and pins and needels in my fingers and feet.

The pressure means that enough oxygen gets to the lungs so ahi is low and o2 saturation is ok. But exhale is difficult because the obstructions in the nose and that is where the issue lies. Dreamwear masks are more restrictive than resmed masks and they have less exhale ventilation.

if i use dreamwear i feel like crap despite good ahi and o2. But using Brevida is much better. So try and check your nose with a good ENT.