You should get a sleep study as well. It's amazing how little oxygen you can get when you sleep. Cpap sucks to wear at night, but it forces you to take the same breathing techniques. Just avoid philips products and go resmed.
This is why I enjoyed the "tape over mouth" tip by nestor. I was a mouth breather and would not feel very rested because of it. When breathing through nose only, I felt so refreshed as if I got more oxygen.
