I'm an absolute newbie, but I was having recurring nightmares about elevators in my late 20s. I was lucky enough to have a lucid dream in which I stopped the DCs from dragging me into the elevator and just asked them why I was having the dreams. What they told me eventually resolved the problem and the nightmares went away. Wish I'd known that it was possible to induce LDs when this started and maybe I wouldn't have suffered so many of those terrifying dreams.