Another thing worth mentioning that can becomes a big problem for some people is getting too excited that moment you realize your inside of a dream and finally lucid. This raises the heart rate, and can pull you out of REM sleep.. It really helps to just take some deep slow breathes and sort of pretend like its no big deal at first..sitting and meditating helps, and often leads to very bizarre visionary experiences in my mind, in a dream, in my mind..0_o lol