I have UCTD and a couple others. My dentist comments on the precarious state of my teeth due to dry mouth.
Suggested I use a gel for oral dryness, better than mouthwash which she suggested the first time. Biotene.
I found a store brand of gel, same ingredients, much less expensive.
CVS dry mouth gel.
Not perfect but lasts longer.
I know about waking up, water sips, too!
Exhausting.
I understand and wish you the best!