The benefits of a good night’s sleep are well documented, but what if a restful sleep isn’t mentally or physically possible? Neurologist Dr. Guy Leschziner joins host Krys Boyd to talk about night terrors, sleepwalking and all the maladies that keep us from sleeping like a baby, which he writes about in “The Nocturnal Brain: Nightmares, Neuroscience, and the Secret World of Sleep.”