There are products to help relieve this condition. Biotene is a good one that can be purchased OTC.

They make a toothpaste, a mouth spray, mouth rinse and mouthwash. The spray works well at night when you don't want to get up and do the whole routine of brushing then rinsing. They also make a gel but I have not tried that one.

Here's a link with lots of helpful info: http://www.biotene.com/