Ira Glass says he never expected to be famous, but as the host of the public radio show "This American Life," he has more than 1.8 million listeners weekly. And now he has a movie he co-wrote and produced opening this weekend called "Sleepwalk With Me," based on a "This American Life" radio story. We talk to Ira Glass about making movies and the evolution of "This American Life."

Watch the trailer for "Sleepwalk With Me":