From my experience with the CPAP mask it seems that the fit and the comfortability is very important if not the most important thing (although getting used to the air blowing into your face also takes time to get used to). In my situation I had to have a full face mask because I couldn’t sleep with my mouth closed. I tried just covering my nose but it wasn't long before the air was rushing out my mouth which was a strange sensation. Of course with the full face mask I had problems also such as the air escaping from the side of the mask, or the mask was so tight that it gave me headaches. You might want to consider a hybrid CPAP mask.
The hybrid mask has a combination of the best features in all the other types of mask. One of best things about this mask is the adjustability of it which helps stop the air leakage and also makes it more comfortable to wear. Another feature is the addition of nasal air pillows which go into your nostrils. It also has something called a chin flap which is good if you breathe through your mouth like me.
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