This is an interesting topic, as I am always searching for different ways to become lucid. I have not tried anything like this personally, but I will follow the thread with interest

I have tried using a DC to gain lucidity. I did not have any luck with it (and can't say I gave it much time or practice) but I believe a technique such as that could be tied into emotions since DC's are projections. So, it could be possible to have a DC tell you that you are dreaming.