I was wondering if any of the time-travel and extraterrestrial visits were intended to be real or a product of Billy Pilgrim's deluded mind. Billy Pilgrim was a real person, according to Kurt Vonnegut. His name was Edward R. Crone, Jr., and he was one of Vonnegut's fellow-prisoners in Dresden. Crone, who was not cut out for being a soldier, gave up completely on life and eventually died in that POW camp. He refused to eat, wouldn't talk, and spent his dying days staring at a wall. Surely Vonnegut's ideas for this novel came about as he pondered what mysterious thoughts must have been going on in the mind of his fellow prisoner in those days.
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