Here's a link to a series of very interesting, cutting-edge talks about sleep that was given at the Salk Institute. It's called "Waking Up to Sleep." It has leading sleep researchers talking about various basic science and clinical aspects of sleep. It's a little technical, but I think people on this forum can appreciate and learn from each of the 26 segments. Coincidentally, Dr. Sejnowski was my faculty advisor while I was an undergrad in the biophysics department at Johns Hopkins.

http://thesciencenetwork.org/programs/waking-up-to-sleep