My Mother couldn't tolerate her C-Pap, of course that was in the days that it was huge, so her doctor ordered just a plain oxygen tubing. Her sleep apnea was profound enough that he didn't feel comfortable in her not having anything at night. So she just uses O2 at a low flow. She just uses the little cannula that you have in the hospital for anything. She has this huge compresser in her bedroom that makes the O2 for her and a very long tubing.

In other words, no C-pap machine at all just oxygen tubing connected to straight oxygen. Yes, she still has the apnea but at least her blood stream is saturated with a higher level of oxygen than she normally would have.