We tend to think of being asleep or awake as an either-or prospect: If you're not asleep, then you must be awake. But sleep disorder specialist and neurologist Guy Leschziner says it's not that simple.
Bell's new novel, "Doctor Sleep," follows a hypnotist and part-time criminologist through three days and nights as he deals with his domestic life and with tracking down a serial killer. Bell is interested in the altered states of mind that come from hypnotism, insomnia, and stress.
Edward Hirsch was an All-American football player in college -- at the same time he became interested in poetry. He talks about how insomnia, sports, and restlessness affect his life and writing. He reads several poems for Fresh Air listeners.