Imagine being able to fly. Walk through walls. Shape-shift. Breathe underwater. Conjure loved ones—or total strangers—out of thin air. Imagine experiencing your nighttime dreams with the same awareness you possess right now—fully functioning memory, imagination, and self-awareness. Imagine being able to use this power to be more creative, solve problems, and discover a deep sense of well-being.This is lucid dreaming—the ability to know you are dreaming while you are in a dream, and...