 Alice Robb says there are people who get really skilled at this. And not only recognize that they're in a dream, but then decide to stay in the dream and can even, you know, take control of what happens in it. She says lucid dreams can be another treatment for nightmares, where you fight off a bully, for instance, but you do it aware at the moment that the whole thing is a dream. So you're kind of making decisions on the fly. You can also use lucid dreaming to practice something, a speech, a performance.