Let’s be clear here: Drooling while you sleep is typically not a health concern whatsoever. In fact, it is quite normal. It can be somewhat embarassing, however, particularly if you drool after having nodded off on a bus, airplane, or on your mother-in-law’s new couch. Drooling while you sleep can also indicate that perhaps there is something else going on with your health that you should be having checked out by a medical professional. These are some of the reasons why you might drool while sleeping, what you can do about it, and how to know when to see a doctor.

There are so many reasons why you might be drooling while sleeping. Some people drool only while taking a nap but otherwise don’t at all. For others, waking up to a wet spot on the pillow is just a run-of-the-mill morning. Sometimes, these reasons are completely benign. However, there are some conditions that can cause you to drool while sleeping that you should consult your healthcare provider about. The following are the 10 most common reasons for droling while sleeping.