on July 23, 2012
at 10:47 PM
It can. Basically you'd be swallowing air, which can happen if you sleep with your mouth open, especially if you snore.
Is there a reason that you sleep with your mouth open, like sleep apnea? I don't find that it is generally very comfortable to sleep with the mouth open as it makes the mouth all dry and can irritate the mucosal linings. Only do that when I have a cold or something and can't breathe through the nose.