I was diagnosed with severe sleep apnea 5 years ago and went through the expensive mouth guard treatment, without success. When I finally decided to go CPAP, I opted for APAP with the nasal pillow mask. Excellent. No problems. I am now getting 8, 9, and sometimes 10 hours uninterrupted sleep per night, wake refreshed, do not fall asleep at my desk at the drop of a hat, and am consistently losing weight. Thank you CPAP Clinic. I wish I had done this 5 years ago, my life is much improved. Mission successful and I am certainly a convert.