They have these lycra snoring straps that wrap sound the chin, head, that may help keep the mouth closed. I also use a humidifier recently, and that seems help. You can leave a pan of water out which puts moisture back in the air too. Keep the air temperature lower as not to dry you out. I brush with biotene dry mouth toothpaste before bed, dry mouth rinse. I keep a bottle of water bedside, and biotene dry mouth spray, that I use during the night if I awaken. Previously, I used the biotene dry mouth gel too on my lips and in mouth before sleep. I also sleep on an incline bed. Sometimes I brush again when I awaken. And I like to drink something carbonated, sugar (helps saliva) and cold, to help clear the mucus like seltzer, soda, even iced tea. Milk replicates saliva, lasts longer than water, which is only 12-16 minutes. I like to make chocolate egg creams too, but not in the moddle of the night, yet! I used these dry mouth tabs during the day, forget name, which stick to the roof of your mouth I used during the day, but read they can be used at night, but I'm cautious of that. I used, and once put the Act dry mouth lozenges in water, which melts, and drank that for dry mouth, but during the day, not at night yet.

I hope this helps.