text: Well, for starters, maybe cut back on the coffee a little.  Caffeinated beverages are dehydrating.\n\nActually, though, I think it's probably as simple as breathing through your mouth while you're sleeping.  Is it possible you have a sinus infection or a deviated septum?  \n\nYou might want to give those nighttime nasal strips a shot.  If you're breathing through your mouth while you sleep because your nasal passages are stuffed up, it could help.