As pictures emerge of Michelle Williams finally returning home from filming in Sweden, stories of Heath Ledger's insomnia are also surfacing. As the media try to build a picture of the actor's character before his early death, I'm sure reports such as these below, won't be the last. Retired city worker Tony Rivera, 52, told US magazine People, that he often saw the actor in Manhatten's Washington Square Park around dawn. Mr Rivera, who walks his dog in the park daily at that time, added

"He would walk early in the morning - around 6:30 am or 7am. He said he always had trouble sleeping. That's why he'd come out so early in the morning. He said it was a great thing, being a dad. He'd say, 'I'm very tired', and he looked it. He didn't seem to be such a good chess player, but I'm not sure. [Mr Rivera sometimes saw the actor playing chess at the public tables]"

In a recent interview Ledger open up about how work-related stress gave him insomnia. During the shooting of his last completed film, The Dark Knight, Ledger told The New York Times in November that he often took the prescribed sleeping aid, Ambien, in an attempt to coax himself into a slumber. "Last week I probably slept an average of two hours a night. I couldn't stop thinking. My body was exhausted and my mind was still going." Ledger continued to say that taking one pill had no effect on him. He'd have to take second to fall asleep, only to awake an hour later with his "mind still racing." Pictures: Splash News / Doug Meszler