First lay out what you want to do in the dream. be it flying, (or in Draven's case, becoming a dragon) and immerse yourself completely into that topic and LDing for a day (or two). Soon enough, you'll get to thinking about it all the time, and it'll just naturally carry over.

Also, i find that the longer I have the intention of doing something in an LD, the easier it becomes, because the more you think about it, the more certain you are of your ability to do it.