I have both dry eyes and dry mouth!

I have suffered from dryness on my whole body for at least 10 years, since age 70! I was tested positive for Sjogren's syndrome. I can tolerate dryness anywhere on my body except my MOUTH! Every night, my bone-dried mouth awaken me, then I have to sip water every few hours all through the night!. I don't have dry mouth during the day. My primary doctor didn't offer any advice! Taping my mouth to keep my mouth closed didn't work. The only mouth moisturizer that help is Biotene Dry Mouth Gel that I have been using every night. This moisturizing gel is quite expensive, also I don't know the bad effects for long term use! I'm hoping to hear from you, the kind MayoConnect people, how you cope with your dry mouth! Thanks so much!