I've been experiencing some trouble breathing after I have dinner and then lie down in bed. It's strange because it doesn't really happen all the time, just usually after I eat and go to lie down. I end up having to take these deep breaths through my mouth because it feels like I'm not getting enough air. But what's odd is that if I wake up in the middle of the night, I don't have the same problem. Is this something I should be concerned about?