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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.
Dry mouth is usually caused by the salivary glands not able to efficiently function and create enough amounts of saliva. If an individual is taking any type of medication, it could be the reason for having dry mouth. Medications that cause dryness of the mouth include: 1  Decongestants. 2  Muscle relaxants. 3  Antihistamines.