Drooling in bed may be caused by sleeping on your stomach. It is recommended to adjust the sleep position, you can take the supine sleep, and if the mouth of the bad bite relationship may also lead to drooling. It is recommended to go to the hospital for examination, and if there is indeed a bad bite relationship then the bite needs to be adjusted. If there is a bad restoration in the mouth it may also stimulate salivary gland secretion and it is recommended to remove the bad restoration. If you do not have the habit of brushing your teeth before going to bed, or if you brush your teeth at night and then have the habit of eating before going to bed, this can lead to a large amount of food residue remaining in the mouth. The residual food residues breed bacteria and also stimulate the secretion of salivary glands, leading to drooling in bed. It is recommended to develop good oral hygiene habits, brush your teeth carefully in the morning and evening, and do not eat again after brushing your teeth at night. If you have the habit of sleeping with your mouth open and are also prone to drooling, it is recommended that you go to the hospital to check if your airway is smooth.