How to 'Engineer' Your Dreams and End Nightmares

How do our dreams connect to health, and how could “dream engineering” help people get over nightmares? Researcher Michelle Carr writes about that in her new book “Nightmare Obscura: A Dream Engineer's Guide Through the Sleeping Mind.” We talk with Carr about why we dream, the benefits of lucid dreaming, and what she’s learning about our ability to “engineer” our dreams.