This is my first response soooooooo here goes. I spent a night at University Hospital with a conclusion I had acid reflex with sleep apnea. WOW! what a surprise. Since I disliked taking medication for anything I desisted. A company brought "the" night ware machine to my house, and insurance covered the use of it. I wore it a couple of weeks, it wasn't doing what they said plus I it was very difficult getting adjusted to it. The visiting technician told me it works better if I'd tape your lips together. I did and it worked better, of course, I had to breath through my nose. So I conclude if breathing through the nose helped why did I need the machine. I tried something they wouldn't recommend I starting sleeping without the machine just with mouth taped, it worked I was able to sleep better. Then I discovered sleeping on my back was the problem so I started sleeping on my left side alternating to my right side but never on my back. That helped greatly. Several months later i tried dispensing taping my mouth. WOW! it worked. About my acid reflex problem through experiment, if I drank a lot of water I was able to curb that problem so every morning first thing, I ALWAYS drank a glass or two of Alkaline water and through the day drink a lot of Alkaline water. I'm exceedingly happy, I sleep well at night and take absolutely no medication. It worked for me, but ................