Deep sleep

Dr. Matthew Walker is the author of "Why We Sleep" and a Professor of neuroscience and psychology at the University of California, Berkeley.

Dr. Matthew Walker is the author of "Why We Sleep."

Kyle Kingsbury is the host of the Human Optimization Podcast. Ben Greenfield is a health and fitness blogger.

Dr. Peter Martone is the owner and director of Atlantis Chiropractic Wellness Centers. He created the Neck Nest – a pillow meant to support the neck instead of the head.

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 IIi of III from his interview with Peter.

Dr. Matthew Walker is the author of Why We Sleep and professor of neuroscience and psychology at the University of California, Berkeley.