I thought I should update this.... and do a synopsis in the process.
I do not sleep with my mouth open. Even if I did, my original headgear provided to me had a chin strap which was useless because it was too big for my face, and even tightened as much as the straps allowed, it would have done nothing to keep my mouth shut. The original RT that came out to the house to fit me for this was, I feel, negligent. He was nice enough, but was pretty much in a hurry to go through the appointment as quickly as he could. He only had the one mask for me to try (presumably he had others somewhere, maybe out in his vehicle?) but he deemed that the mask fit me, and he left. So, the mask did not fit, I did not understand how important it was at the time, because I hadn't started trying to use it yet.
But, it was an issue, because the mask leaked at my nose, it was a nasal pillow type mask, and if I tightened it enough to try to keep a seal there, it hurt my nose, it pushed it up too much, and it still leaked. It just was not a good fit all the way around, and I eventually ordered myself a mask off of the internet.
The other problem was that the velocity of the air pressure was too high. First, because I was required to try and fail a CPAP, (for insurance purposes) and then, because the expiratory pressure was initially set too high when I was switched to BiPAP.
Then it was good for a while, but gradually I started having problems with my lips getting blown open when I slept, which lead to dry mouth, the humidifier running out of water, just the whole hassle all over again. This was when I first joined in posting on this thread. I tried to design a chin strap that would hold my lips closed, as it was not my mouth opening due to my jaw, but rather my lips.
The design eventually came up with did work, it kept my lips from opening, but I needed softer fabric, and adding more straps to my head just got all tangled up with my hair, so, instead of trying to make another one with different cloth, I resigned myself to just biting the bullet, paying out of pocket for a full face mask.
.... Then it dawned on me. :idea:It wasn't my lips per se. Yes, their seal is weaker than it used to be, (for example) I can no longer even attempt to swish mouthwash in my mouth, I just have to hold it and then spit it out.... but, if the pressure of my BiPAP was set correctly, why was the air bubbling up and escaping out of my lips, rather than just staying back in my throat, in the passage to my nose, from my lungs ?
My pulmonologist agreed, he had the RT come out and lower the settings on my BiPAP, and it completely solved the problem.
After struggling with this machine for months now, this is what I think:
If a person sleeps with their mouth open, they need a mask with a chin strap which actually fits, (what a concept!) or to get a full face mask so they can sleep with their mouth open.
If a person is "overblown" then the problem is the machine settings. Its just as important to be able to breathe out the Co2 as it is to breath in enough air, so if there are problems managing the flow, then kick up a fuss, and get the machine set correctly.
When the settings are correct, and the mask fits, a BiPAP is a wonderful thing. It helps so much, and it helps in many ways, I'm less fatigued, I don't get headaches when I sleep... When I'm just having a weak day all the way around, I can put it on for 20 minutes or so, and it helps me to feel better. It is well worth the effort to fight to get it right.