Yeah, did the whole thing...Sleep study (mild sleep apnea). Tried the mask...Just the nose pieces. That still didn't work...I felt I was suffocating. So I went back and got a referral to a dentist to try the mouth piece. I use it about 1/3 of the time...Trying to remember to put it in. When I have it in I have a hard time getting to sleep. I usually sleep on my stomach with one leg up (without the mouth piece). But I can't sleep that way with the mouth piece...My drool drains out my mouth, so I wake up 1/2 asleep. It is hard to sleep on my back...Just doesn't feel right with the mouth piece in there. Last night I finally found a position that works for "me"...You may be different. Everyone is different in their situations.
I will sleep in a posture where I am 1/2 way between my side and back. I turn about 45 degrees to my side. I then adjust my legs to a comfortable position. I think I have only slept in this position once with my mouth piece in. I think it puts less pressure on my stomach (the jelly rolls (fat on my sides) have less pressure).
I have also lost some weigh in the last few weeks (over 10 years out). I am exercising and eating better. I've gone below 200 pounds last night...It may help with the apnea. I have insomnia and am weaning off of a lot of sleep meds...It's been hard. I've had 2 heart attacks over the years, so I need to watch my apnea and sleep a lot. Just sharing my journey. Brian
Before you self-diagnose yourself and switch to the mouth piece, I would recommend you return to your doctor and have a new sleep study done. Maybe you don't need it ... maybe you need the mask with the pressurized air ... only your doctor should be telling you what to do.