I've been using a cpap for 8+ years now. My father uses one too. Neither of us is overweight, so there is some other cause. I know it runs in families.
I also grind my teeth.
I have a new dentist. When he first looked in my mouth, the first thing he mentioned is that I'm tongue-tied. It's a posterior tongue tie, meaning the frenulum (a piece of flesh under the tongue) is pulling my tongue backward, and when I'm sleeping may be the source of the OSA. In response to that, he says, it grind my teeth in order to open the airway.
Dr. Google does not have much info out there about this. In fact, most of what I find has to do with severe tongue ties in babies that affect their ability to nurse properly. My tongue tie is posterior, meaning it's attached further back on the tongue, so is not really visible unless I open my mouth widely.
Has anyone else ever heard of this? I'm considering a frenectomy to see if things improve.
Everything has a cause, and no one has ever offered a cause for why people with low body fat get OSA, other than "it's genetic." If tongue ties are genetic, and it's fixable, makes sense to fix it, right?
But why do surgery if it's a red herring.