Do we really need to sleep? Dr. Thomas Neylan looks at intrinsic sleep disorders such as sleep apnea and insomnia and what to do if they affect you. Dr. Elissaios Karageorgio looks at how aging affects sleep and Dr. Rochelle Zak looks at the neurophysiology of sleep. Series: "Mini Medical School for the Public" [Health and Medicine] [Show ID: 30139]