I used to look in the dream books which never worked for me lol...I mean nowhere in the book did it ever say, "Dream about going to your high school band concert, your friend killing an innocent man, and everyone being fine with it until a yu-gi-oh rendition of the mob shows up. Your engaged in an epic battle where you almost escape through the gift shop before, video taping the whole thing before your found by the very hot bad guy and dragged off for god knows what =then this means you are feeling..." Yeah. My dreams are too freaking complicated for that lol. I have never just had a falling dream, or a masochistic dream like pulling my hair out or my teeth falling out. Although in one longer dream once my teeth did fall out.
As far as what theory I think on them? Well I do think they link to us as individuals and to what we are feeling. I think everything we come into contact with affects us in some way or shape. The emotions we have do the same thing. And thus results in mixed and scrambled messages of our worries, fears, needs, and wants.
As to what mine mean? Haha, no clue. But I have even tried keeping a journal...wake up write it down, go to sleep have another, wake up write it down. It did lead to something interesting, like the same character following me in each dream I had that night. But overall the dreams are still long, complicated, and pretty random.