Dr. Robert Sapolsky is a professor of biological sciences at Stanford. He's the author of "Why Zebras Don't Get Ulcers" as well as his latest work - "Behave: The Biology of Humans at Our Best and Worst."
Dr. Matthew Walker is the author of Why We Sleep and professor of neuroscience and psychology at the University of California, Berkeley. This is Part II of III from his interview with Peter.
Shawn Stevenson is the author of Sleep Smarter: 21 Essential Strategies to Sleep Your Way to A Better Body, Better Health, and Bigger Success. He hosts The Model Health Show.
