You could look for large leak using sleepyhead. When caused by open mouth, the leak tends to be high; and "flat-tops" on the graph.
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Thanks a lot both of you.
My case was similar. I was diagnosed with severe apnea with an AHI score of 59 and was desaturating into the 70's.
I first hired a pulmonologist. He told me: "Untreated, this is fatal -- but if you persevere with treatment, in six months you'll fell 10 years younger". (He was wrong, I felt 20 years younger).
My general practitioner when he saw the sleep study said: "The fact that you have apnea is incontrovertible. Desaturating into the 70's, your blood can clot. If the clot goes to your brain, you have a stroke. If it goes to your heart, you have a heart attack."
It's now 3 years later. Wow, what a difference. I love that machine. It's so nice to feel alive again. And the snoring goes away the first night. Tell your friend how much better life can be.
I had a minor heart ailment (Bigeminy). After two years of therapy, it went away.