Pills of Sanofi-Aventis SA's Ambien, the top-selling insomni

UNITED STATES - MARCH 23: Pills of Sanofi-Aventis SA's Ambien, the top-selling insomnia drug in the U.S., are arranged in a Cambridge, Massachusetts pharmacy Wednesday, March 23, 2006. The number of prescriptions for sleeping pills have dipped in recent weeks after reports that Ambien may cause binge eating and driving while sleepwalking. New prescriptions fell 11 percent for Ambien and 4.1 percent for Sepracor Inc.'s Lunesta in the two weeks after the New York Times reported the rare side effects. (Photo by Jb Reed/Bloomberg via Getty Images)