Is Your Mouth Open While You Sleep?

I think I don't breathe as deeply as I could, but I don't know if it's... I don't think it has anything to do with my nose. Is your mouth open when you're sleeping? Yeah. It's definitely open while I sleep. Especially when I breathe in, I'm like sucking in. But maybe that's my lungs getting bigger. And then when you breathe out, everything like fills up again. So I'd like a sleep study as long as we're here, Doc. Let's just fucking put everything to the test. We'll get this thing done together.