Dr. Michel Jouvet, a neurophysiologist who discovered the region of the brain that controls rapid eye movement, and who helped define REM sleep as a unique state of consciousness common to humans and animals alike, was found dead on Oct. 3 in Villeurbanne, France. He was 91.
Pierre-Hervé Luppi, a fellow researcher who worked with Dr. Jouvet for many years, said he had died overnight at a hospital.