Ledger discussed his role in a recent interview with The New York Times, where he described The Joker as a 'psychopathic, mass-murdering, schizophrenic clown with zero empathy.' It's clear the role is physically draining him as his sleep patterns have been affected as he claimed, 'Last week I probably slept an average of two hours a night,' he said, adding that his body may be tired but that his mind 'was still going.' Another interesting revelation was the fact that Ledger has been keeping a 'Joker Diary' to prepare for his role. The Times describes the journal as 'filled with images and thoughts helpful to the Joker back story, like a list of things the Joker would find funny. Add this to the fact when preparing for the role Ledger lived alone in a hotel room for six weeks, formulating the character's posture, voice and psychology.
holy canoli, batmans!