Sleeping at night with a dry mouth. First, it may be due to the night to eat a lot of spicy, stimulating food caused by, this time the general advice to drink a moderate amount of warm water, can be conducive to alleviate the phenomenon of dry mouth. Secondly, it may be due to smoking too much or drinking too much caused by this kind of advice proper rest, and try to avoid these bad habits. Third, sleep at night dry mouth, may also be due to occupational reasons, such as teachers or lecturers, then often talk are prone to produce dry mouth phenomenon. Fourth, sleep at night dry mouth may also be caused by environmental factors, such as indoor hot or dry air, are prone to dry mouth phenomenon, you can generally choose to use a humidifier or more laundry drying indoors, to improve indoor humidity will be able to alleviate the phenomenon of dry mouth.