(CNN) – Leonardo DiCaprio and Ellen Page star in Christopher Nolan's summer blockbuster, "Inception." The movie deals with stealing and planting thoughts inside someone's mind while they dream, a sort of nocturnal espionage. Is it real or science fiction? Deirdre Barrett is a clinical psychologist with Harvard Medical School and a leader in the field … Continue reading The science of 'Inception': Can your dreams be manipulated?