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Other diseases which cause dry mouth, not only during the night but during the day as well â these are viral and bacterial infections and Sjogrenâs syndrome, all of which have an influence on the flow of saliva. Other problems that affect the saliva flow include: 1  Bellâs palsy. 2  Tumors. 3  Salivary gland stones. 4  Depression.
Dr. Thomas Klein Dr. Klein. 1 doctor agreed: Mouth breathing: Your throat may be getting dry at night from breathing through your mouth while you sleep. You may be mouth breathing due to nasal congestion and nasal blockage that may be due to allergies. I recommend that you see an allergist to get checked for allergies.