Drooling can be cute when it comes to babies and puppies, but when you’re an adult, it’s not ideal. In addition to being kind of gross, it can also be messy and embarrassing. However, while a little spittle is normal occasionally, if you’ve been waking up with puddles of excess saliva on your pillow, it could be an indication of a bigger problem. Here’s why drooling may be a warning sign of sleep apnea, and what you can do to have drier, more comfortable nights.