I have been having a dry spell right now its been only a few weeks. But in the past I have gone up to a year without a ld. I have been ld all my life off and on. I try to get better at dream recall that usualy helps. I have also tried a mugwort pillow it seems to work sometimes to bring back my lucidity. I also do a meditation before bed lying on my back( I do not sleep on my back though ) just relaxing then I tell myself I will have a ld . Then if all else fails I do not think about it for a bit and eventually they come back . I also seem to revisit the how to stuff on lucid dreaming in case I forgot something .Sometimes its just the point in our lives where other dreams need to be dreamed .At least that is how I see it But once you have lucid dreamed you will do it again . Stress does have something to do with it too as the people up above have said. I am a crafter so before a big show I dont seem to be lucid because I am too busy making crafts that it runs into my dreams. Good luck .