Ok, my resp tech exchanged my full face mask with a snapp-x nasal pillow system. I tried it for about 3 nights and it was a BIG improvement over the full face mask! Meanwhile my dad shipped me his 6 month old swift mirage nasal pillow mask..and it was BETTER than the snapp system in my opinion! It was lighter, the nasal pillows more comfortable, less intrusive, but just a tad noisier at exhalation ports. I have not had any experiences with my mouth opening and my sleep has been great still, and my energy level HIGH..Im sooooooooo happy!!