Yellow drooling at night due to inflammation of the oral cavity or digestive diseases and other reasons, you should consult a doctor to find out the cause of the disease. 1. inflammation of the oral cavity: such as gingivitis, periodontitis or dental caries and other diseases, if subjected to adverse stimuli will promote the secretion of saliva, resulting in yellow drooling in bed at night. In addition, if the dental inflammation will also cause bleeding, usually must pay attention to oral hygiene, rinse mouth, brush teeth. 2. Digestive tract diseases: such as gastritis, in the night sleep stomach food is not fully digested, resulting in the secretion of excessive gastric acid, thus causing yellow drooling. Usually must pay attention to light diet, not overeating. Patients should go to the hospital in time into the stomatology or gastroenterology department to check, perform relevant tests, clarify the cause of the disease, and actively cooperate with the treatment.