Is it normal to sleep with your mouth slightly open?
Mostly.Normal for most people
Yes, sleeping with your mouth slightly open is common and often just happens when your jaw relaxes or your nose is a bit stuffy. If you regularly wake up with a very dry mouth or also snore loudly, gasp, or feel unusually tired during the day, it’s worth looking into.
Yes—lots of people sleep with their lips parted a little. Your jaw relaxes as you fall asleep, and congestion or allergies can make nose-breathing less comfortable, so your mouth may drop open without you noticing.
By itself, a slightly open mouth usually isn’t a big deal. If it comes with loud snoring, gasping or pauses in breathing, or you’re often very sleepy during the day, check in with a healthcare professional.