I had success with this method last night. Lately before I go to sleep and whenever I wake up during, the night, I've been thinking "The next person I talk to will be a DC." Finally, last night I woke up after a vivid dream with a DC that is one of my dream signs (DS = talking to a person from work, when I'm not at work). Then I woke up, realized that I really should have recognized that I was dreaming, and I went back to sleep, really believing that the next person I saw would alert me that I was dreaming (not directly, but just by seeing them.) It worked; I kind of went back into the same dream, and became lucid when I started talking to somebody. Now that I write this I realize that going back into the same dream probably helped too; but the DC is what I was focusing on.

So...I'll keep trying this; hope it keeps working.