Do a lot of energy work- when you have an RTZ OBE most of the energy you have is used to 'feed' the projectable double. So if your energy isn't the 'best' to start with, you'll use a lot of it to get out, and then will lose lucidity and will 'fall' into a dream. That's ok, as long as you are lucid enough to see 'where' the situation changes. After all, a dream is a type of projection, and if you're lucid you can always leave it and re-project. Or use it as a platform to take off and project into the astral. The trick is to not lose lucidity, because after lucidity comes memory, and that's the problem you don't want to have.