Reading: CPAP Mask Types and Fit: Nasal, Pillow, and Full-Face Compared — the three classes, what each does well, and how to size them. CPAP Nasal Congestion and Stuffy Nose: Causes and Fixes — question 1 above, which decides more of this than anything else. Nothing on SomniTalk is medical advice. Talk to your own clinician before changing therapy.