What can I do to stop from excessively salivating at night?

Nighttime salivating. Many possibilities. Perhaps you are regurgitating stomach contents during the night and irritating your throat and mouth. This is called gurd. Try not eating after 7, avoiding alcohol, losing weight if over weight, stop smoking, sleeping on your side if you snore and elevating head of bed 6 inches. If no help see your doctor for an examination.