While that sounds paranoid at first, it is not really and fits in with my statement. It could be a strange odor, not readily noticeable while awake, that is triggering the dreams in all of you. Or perhaps even a sound that one does not notice during waking that intrudes upon the mind when sleeping. If this is 'common', might want to look at those issues.
So you are dream projecting......Hmmmmmmmmm, powerful mojo there!