健康的成人，每日的口水分泌量约为1000至1500毫升，在没有进食或其他刺激的状态下，也会正常分泌30毫升的口水。 在趴着睡觉时，因唾液腺容易被压迫，所以就会造成流口水的情形，此为正常现象；但很多人不是处于趴睡时，仍有一夜醒来后发现枕头湿湿，被口水浸润的 情形；如果是这样，千万别觉得睡觉流口水是正常的小事，因为它或是疾病的征兆。
若睡着后流口水，隔天醒来时照镜子，对着镜时发现嘴巴歪斜并伴随有头痛等症状，就有发生中风的危险，有以上症状者需尽速到医院进行相关疾病的检查 ！ 而脑梗塞的患者脑部供血不足，循环不畅，所以，大脑无法发出正确指令引起流口水，并常伴随着睡觉时手脚发麻的症状。
For a healthy adult, the normal daily production of saliva varies between 1000ml and 1500ml. In the absence of food or other stimulation, it will normally secrete 30 ml of saliva. It is common to have drooling occurs when sleeping on your stomach, which is normal as the salivary glands are easily compressed. But many people still find their pillows wet and soaked with saliva after waking up overnight even they are not sleeping on their stomachs; If that is the case, never assume that drooling while sleeping is normal, because it may be a sign a larger health problem.
6 warning signs and symptoms when drooling while sleeping!
1. Inflammation of the mouth or deformity of the front teeth
When oral hygiene is not maintained, the temperature and humidity of the oral cavity, with the food residues on the surface of the teeth and between the teeth, are the best hotbed for bacteria and viruses, which easily cause inflammation. For example, when tooth decay and periodontal disease occur, it will promote saliva secretion and drool during sleep; and congenital genetic factors or acquired bad habits such as nail biting, tongue biting and pencil biting can cause anterior teeth deformities, which will easily make you drool while sleeping.
2. Mental exhaustion/ Mental fatigue
When a person is extremely tired, mental exhaustion, or after taking certain drugs, it may cause neurological disorders, abnormal parasympathetic nervous system during sleep, and drooling while sleeping. It is recommended to promptly adjust the state of mind and take more rest to avoid the risk of decreased immunity and other diseases.
3. Facial nerve disorders
If drooling while sleeping happen after the face exposure to cold or caught cold, accompanied by problems such as eyelids that won’t fully close or a crooked smile, drooling,normal expressions, etc., it may be caused by facial nerve disorders.
4. Early sign of Stroke
If you drool after falling asleep, when you wake up the next day,look in the mirror and find that your mouth is tilted and accompanied by headaches and other symptoms,you might are at risk of stroke. Those with the above symptoms should go to the hospital for a check-up as soon as possible! In patients with cerebral infarction, the blood supply to the brain is insufficient and the circulation is not smooth. Therefore, the brain cannot give the correct signal and hence cause drooling, which is often accompanied by symptoms of numbness in the hands and feet while sleeping.
Arteriosclerosis can cause hypoxia and ischemia to the brain and muscles, causing the muscles of the face and throat to relax, and the the ability to swallow is also reduced, making it easy to drool during sleep. This phenomenon is particularly likely to occur in older people.
6. Dysfunction of Spleen-Stomach
Many modern people have eating disorders and experiences stress at work ,or spleen and stomach dysfunction results from physical weakness, which can cause abnormal body fluid metabolism. Insufficient muscle elasticity lead to relaxation of the muscle, so it is easy to open the mouth after falling asleep, and the excess saliva also flows out.