In their New York Times interview, published on 4 November 2007, Ledger told Sarah Lyall that his recently completed roles in I'm Not There (2007) and The Dark Knight (2008) had taken a toll on his ability to sleep: "Last week I probably slept an average of two hours a night. ...
I et New York Times-interview, udgivet den 4. november 2007, fortalte Ledger Sarah Lyall, at hans nylige afsluttede arbejde med filmene I'm Not There (2007) og The Dark Knight (2008), havde fjernet hans evne til at sove: "Sidste uge sov jeg i gennemsnit 2 timer per nat...