Pregnant sleep drooling has the following situations: 1, after pregnancy, the body’s progesterone will increase a lot, which will enhance the function of the salivary glands, saliva secretion will increase a lot, so sleep drooling. 2, the increase in progesterone will affect the peristalsis of the stomach and intestines, affecting the digestive system, which will lead to drooling in bed. 3, sleep posture is not correct, such as sleeping on the side or lying on the stomach, the mouth will not be involuntarily 4, oral diseases can lead to saliva secretion in the mouth increases a lot, leading to drooling in bed. 5, dental deformities, such as teeth, buck teeth, etc. can lead to drooling in bed. 6, drug effects, such as antidepressant drugs, inhibit the central nervous system drugs, these drugs have certain side effects, will lead to drooling in bed. 7, rhinitis, sinusitis and other diseases Will lead to the nose is not ventilated, so only through the mouth to breathe, sleep mouth can not be closed will lead to drooling.