If you are having a "lucid" dream, you have the capacity to control the action...to write the script, do to speak. The next time you have one of these "events", look at the hands of someone in the dream...even your own hands. If it is a dream, the hands will always be misshapen...some fingers too long, etc. Alternatively, hold your nose and try to breathe. In a dream, you will have no problem breathing thru your nose even though you have it pinched shut.