A patient has written a disturbing account of life with a condition that makes him think he is dead - and how he spent his days in graveyards as it was "the closest I could get to death".

The British man, identified only as Graham, woke up nine years ago utterly convinced that he was no longer alive, even though he was still breathing.

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Doctors diagnosed him with Cotard’s syndrome, which is also known as "walking corpse syndrome" because it makes people think they have turned into zombies.

Graham did not believe them, however, and insisted that his brain was dead.