Did Sleep Deprivation Lead to Attack on U.S. Rep. Gabrielle Giffords?

Politicians and pundits continue to argue whether vitriolic partisan politics inspired the shooting of U.S. Rep. Gabrielle Giffords on Saturday. Another factor that may have pushed alleged gunman Jared Lee Loughner to go on a killing spree that left six dead and 14 injured remains left out of the discussion.Bizarre online ramblings allegedly posted by Loughner reveal he may have had insomnia