How come none of the masks worked? I was fully prepared to have to go through the entire gamut of masks to find one that worked, because I snore so surely I wo

How come none of the masks worked? I was fully prepared to have to go through the entire gamut of masks to find one that worked, because I snore so surely I would need a mask that covers my mouth at least, right? But even while sleeping, my brain is keeping my mouth shut so the simplest, nose-only mask works perfectly, with very little leakage.