David Peña-Guzman is Associate Professor at San Francisco State University. In his latest book, When Animals Dream, Dr. Peña-Guzman wonders whether humans are the only dreamers on Earth. What goes on in the minds of animals when they sleep? The book, When Animals Dream, brings together behavioral and neuroscientific research on animal sleep with philosophical theories of dreaming. It shows that dreams provide an invaluable window into the cognitive and emotional lives of nonhuman animals, giving us access to a seemingly inaccessible realm of animal experience.