Heath Ledger dies

[Iscariot]

I'm well aware of that and since he possessed all those drugs, I am going to guess that he was at least partially aware of that (his reactions to them) too. I just think knowing the doses he took would go a long way towards determining if he OD'ed on purpose or not.

When you're on a number of drugs like this, it's hard to keep the dosages straight. Case in point would be the Canadian musician Matthew Good. Good suffers from (I believe) anxiety and depression, and was on a variety of medications. These kinds of medications can have an adverse affect on your mind, and without knowing it he one day took something like 40 pills, massively overdosing. He was rushed to the ER and they managed to flush his system, but it was a very close call. It was certainly not intentional, and he didn't realize he had taken so many. A combination of pre-programmed behaviour -- take one of these when you "feel" an attack -- and a desperation for relief caused him to accidentally overdose.

Being massively sleep deprived, the haziness caused by multiple sleeping pills, and a desperate need for relief could very easily cause one to lose track of even such an important task.