I do not know what technique you are speaking of, but I guess it would work if you do it enough. I think you are talking about the second half of the MILD technique, where first you go to sleep, syaying to youself that you will wake up after ever dream and recall your dreams. Then, when youu wake up, you write your dreams down if you remember (and even if you don't remember) and then go to sleep doing the visualizing. Only in that technique you are visualizing that you are in one of your previous dreams and you realize you are in a dream in the dream... I don't know if that made sense. I will try to explain graphically:

You sleep---> Dream---> wake up and write down dreams--->visualize the following: [your previous dream(inside that dream you realize you are dreaming)]---> lucidity!!

Again, I don't knwo if how I am explaining makes sense or if I am just rambling.

Anyway, I am currently working on that technique right now, part of my improving dream recall plan.

How good is your recall?