On the risks of immersing oneself in a role:
’In 2008, actor Heath Ledger accidentally overdosed on sleeping pills and died, aged 28.
One myth that attached itself to Ledger’s death was that it was somehow a result of immersing himself in the character of the Joker.
New research suggest that fully immersed actors “forget themselves” in the sense that they actively ignore facts about who they are, temporarily subordinating their own thoughts and feelings to those of their character.…’
Via Big Think