Good morning all
I just returned from a hunting trip to the interior (kamloops) area with my son, while there (a week) I had terrible dry mouth while sleeping had to wake up every couple hours for water. The area I was in was cold and had a propane fireplace for heat in the cabin. I thought that maybe something was changing with my post treatment symptoms but no as soon as I got home I was able to sleep all night without any dry mouth at all. Maybe try using a humidifier as this helped me during the worst times, I live on the west coast (Vancouver island) and the air here is very moist.
Good luck ken