William Dement, known as the father of sleep medicine, dies at 91 His work changed my understanding of sleep (when I was a post-doc!), which helps me to be a more thoughtful and productive scientist now. Sleep = brain health. https://www.washingtonpost.com/local/obituaries/william-dement-psychiatrist-known-as-the-father-of-sleep-medicine-dies-at-91/2020/06/22/ca70e21a-b3c8-11ea-a510-55bf26485c93_story.html