The 40-year-old actor - who plays a psychic who can see dead people in his latest film `Hereafter`
didn`t even visit any real-life mystics to research his part for fear of falling down a "rabbit hole" of pretence.
He said: "Had I found a good one I would have. What I was worried about was that it was just going to take me down this rabbit hole of charlatans. I think a large part of that space is occupied by pretenders, which is not to say there aren`t people out there who are genuinely touched in some way. I just didn`t get a chance to meet any of them."
However, Matt is open-minded to the idea of near-death experiences - after actor Martin Sheen told him about his own almost-fatal heart attack when he was working on the set of `Apocalypse Now`.
He continued: "But I did speak to Martin Sheen, who had a near-death experience on `Apocalypse Now` when he had a heart attack. He told me his incredible story one day when we were working on `The Departed` together.
"It`s a very well catalogued experience that a lot of people have had. One person I read was legally dead for 28 minutes, which I think is the record."
Matt also admitted his discussions have made him less afraid of death.
He said: "It`s interesting. I assume most people are afraid of death, but the people who have had these experiences aren`t. That seems to be one of the things they have in common - that they don`t have any fear of it any more."