Neuroscientist and sleep diplomat Matthew Walker on how your brain, heart, immune system, and genetics can be negatively affected by even an hour less of sleep each night, and how to sleep better for a longer, healthier life.

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Neuroscientist and sleep diplomat Dr. Matthew Walker is a former Professor of Psychiatry at Harvard Medical School and currently is Professor of Neuroscience and Psychology at the UC Berkeley. He is also the director of the Center for Human Sleep Science at the UC Berkeley. In his best-selling book, Why We Sleep, he argues that we are in the midst of a public health crisis caused by a global sleep-loss epidemic. Why We Sleep explains how we can harness sleep to improve everything from learning, mood, energy levels, preventing diseases, slow the effects of aging and much more. Dr. Walker is also a Sleep Scientist for Google.