Howdy, morrigan.
It is not unheard of for people who don't ordinarily have sleep paralysis to have a sleep paralysis event when sleeping in an unfamiliar "bed." All three afflicted family members slept on the couch, even though the couch was as an unusual place for each of them to sleep:
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Very rarely did anyone sleep in the room... his brother (for reasons I no longer remember) wound up sleeping in the room. .. The older sister, not being able to sleep due to the little one's coughing, decided to sleep in the studio room
Sleep paralysis is often accompanied by "explanatory" hallucinations. An imp sitting on one's chest will do nicely as an "explanation" of difficult breathing.
As to the parallelism of the three stories: these people were of the same generation living together in the same house. They saw the same cartoon shows, horror movies, and read the same comic books, Harry Potter novels, or whatever. They could discuss those freely enough, and perhaps there was a consensus among them, conscious or otherwise, about what "scary" personified (impified?) would look like.
Spoken narratives may be recognized as "the same" despite great differences in the details of the experiences being described. Living together is a factor there, too, since there could easily be some commonality among sibs in their favorite turns of phrase and choices of words.
Since you were not living in the house (if I understand the situation), then you are not in a position to say what the older brother did or did not tell the younger brother. Nor is explicit statement the only way for one brother to convey the gist of an experience to another.
You do know that the two brothers discussed the younger bother's experience. So far as I can tell, you have no information at all about what the younger brother may have told his sister.
The brothers did not immediately tell their stories to the parents when their sister was in distress, which is a curious detail. Perhaps the younger brother, maybe both brothers, were concerned about some appearance of responsibility for their sister's misadventure.
I think this is a great story about how the human mind works, and I thank you for the opportunity to read it. However, there are entirely natural mechanisms by which three closely related people might have three closely related experiences. I believe that that is what happened here.
Edited by eight bits, 01 July 2008 - 09:26 PM.