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Indeed, it is not narcolepsy in goats. A narcoleptic will be unconscious/asleep during an episode, while a myotonic goat is perfectly awake and aware of its surroundings. It's not truly fainting, but contraction of their muscles so they are paralyzed. They don't even always fall down, some just run around with stiff legs. They are often raised for meat, but I think their biggest popularity is just as a novelty pet.
I'd be inclined to think maybe this is a scam, being on craigslist. There's lots of them on there, unfortunately. If you are interested in them, I'd request to see the birds in person and witness their 'fainting' episodes...I'd also want to know what causes it before dishing out that kind of money, in case they are sick! Also, I think it would make them more prone to predator attacks if they are helpless when startled...fainting goats are sometimes placed in a flock of sheep so that when a predator chases the sheep, the goat will fall over and attract the predator to eat it while the sheep get away.