Well, this is just peachy. Apparently, I have this too. I have a brand-new NIV machine that I am struggling mightily to learn how to use, with not much luck so far. It feels wonderful, but I have been so far unable to fall asleep with it. My sleep study showed my C02 levels very high when sleeping, and I feel like I get very little real sleep/rest. I sleep only a couple of hours at a time, and with little benefit. Just read that article, and yup. So, I guess I'll be visiting the sister site too.