Do you or a loved one have symptoms of one of the 90 different sleep disorders? Close to 40% of Americans experience problems with falling asleep or daytime sleepiness. Learn more about sleep and sleep conditions, what new tools can diagnose and treat sleep disorders, and what you can do to naturally improve your sleep. Clete Kushida, ’81, MS ’82, is a neurologist and professor of psychiatry and behavioral sciences, medical director of the Stanford Sleep Medicine Center, and director of the Stanford Center for Human Sleep Research. His interests include the changes associated with sleep apnea and sleep loss countermeasures. He is currently the President of the World Sleep Society. Classes Without Quizzes are presented by the Stanford Alumni Association. This talk was filmed at Stanford Reunion Homecoming 2016.