“Yes, lucid dreaming exists,” said Dr. Rodney Radtke, the medical director of the Sleep Disorders Center at Duke University. “Yes, people certainly can, within their dream, realize ‘this is just a dream’ and continue to participate.”

“Do I believe that someone could potentially alter or interact with their dreams in such a way that they could change the dream? Yes,” he said. “Do I think that you could essentially design a dream — ‘Oh, I want to go to Honolulu and have this big hunk hit on me’? It’s a bit of a stretch. But I can’t say it can’t happen.”