This is WEEKEND EDITION from NPR News. I'm Rachel Martin.
In the late 1980s and early '90s, success in the competitive world of late-night television sounded like this.
(SOUNDBITE OF CHEERING AND DOG POUND NOISE)
MARTIN: That, of course, was the signature shout out from "The Arsenio Hall Show." Arsenio interviewed everyone from Muhammad Ali to Madonna and, of course, there was that seminal pop culture moment when then-presidential candidate Bill Clinton played the sax on the Arsenio stage.
On the surface, Norman Rush's new novel is about a middle-aged man, Ned, who reunites with a group of college friends after one member of the group dies unexpectedly. But what transpires over the next few days ahead of the memorial service is less about Ned's relationship with these men and the heady, self-absorbed days of yore, and more about how Ned sees himself.
We spend about one-third of our lives sleeping, but much of that function remains a mystery. Weekend Edition Sunday is asking some pretty fundamental, yet complicated, questions about why we do it and why we can't seem to get more of it.
Dr. Matthew Walker says the question of why we sleep remains "that archetypal mystery."
Walker, the principal investigator at the sleep lab the University of California, Berkeley, works with patients who suffer from sleep abnormalities. He says the complexity of sleep makes the research that much more fascinating.