Addie Morfoot Contributor In his latest documentary “In Restless Dreams: The Music of Paul Simon,” Alex Gibney explores the singer-songwriter’s six-decade career. The Oscar winning director also captures Simon creating his latest album, “Seven Psalms,” which he made while losing hearing in his left ear. Although Gibney is mostly recognized for his rigorously researched investigative exposes (“Enron: The Smartest Guys in the Room,” “Going Clear: Scientology and the Prison of Belief”), he is also skilled in creating portraits of cultural icons like Simon.