I know some certain things can help LDs (I think b12 was one but I'm not sure) and some things can hinder them (caffiene).....so I guess it is possible your medicine could help produce dreams but I don't know much in that area.

For the second part, I too had trouble falling alseep mainly because I was excited and hoping for a lucid, so looking back it was counter productive I think :p Cooling down might help but you just have to find a balance between wanting it so bad and not letting it get to you. If your scared because your heart is pumping fast or numbness or whatever, just remind yourself that you go through it everynight that's just Sleep Paralysis.