This Is Your Brain With Dr. Phil Stieg

More than an evolutionary waste of energy, dreams are one of the last mysteries of human cognition. Dr. Raphael Vallat, a neuroscientist and sleep researcher at UC Berkeley, explains what we know about what happens during REM sleep, why we have recurring nightmares, and even how that evening cocktail affects your dreams. Plus… the weirdest things some people do while they're asleep