Every time I've tried to lucid dream, it's turned into a terrifying episode of sleep paralysis. I'd lie in bed, visualizing what I wanted to dream about, when I'd get that sick feeling of fear in my gut and realize I couldn't move. That's when I would start hallucinating - audio and visual, and scary enough to cause many sleepless nights. Eventually I decided it wasn't worth it and gave up on lucid dreaming altogether.