Hmm.. as TheAuthor said trying too much will usually hinder it. Remember that it is your mind your are teaching to think in a new way. You cannot essentially force it, you have to change it to look world differently. I'd say don't try consciously so hard. Try to train your subconscious because that is what you need in dreamstate.

How to train subconscious? There are many methods all ready in this post. Learn to question why you are where you are, when you are and are you dreaming. If you see something odd, anything at all, something that interrupts your normal mind, try to see what reality you are in. Awake or dreaming. That is the only trustworthy way I have encountered. You cannot rely on conscious RCs, you have to do it because your subconsious decides to question the enviroment.

/end_ramble