Billy is insane. It's official. His mental institution stay, lack of emotion, and untalkativeness shows his insanity.  Billy admitted himself into an institute because of his instability. Additionally, he talks I'm his sleep according to his room partner in the hospital after the crash. The roommate continually states his insanity because of his constant blabbering. His wife Lily agrees solely because she wants to please her husband. His quietness is also a sign of his insanity. His quietness goes hand in hand with his lack of emotion. He continual shows no emotion to his wife and other Individual. Even at the death of his wife, he hardly reacted. " Even though her father was broken and her mother was dead"(Vonnegut, 188). I am certain that Billy, from his war experiences does not feel or think like any other human.