alt Hacker News"communicate" seems like the really interesting part of this, but gets a one-off mention only.
like, how does this communication work? how does one sleeping person communicate skills to another sleeping person?
have we found the mechanism? was it awake poeple communicating to sleeping people? the reverse?
Stephen LaBerge's book explains, in detail, how they would communicate with lucid dreamers during their research. I don't remember how the researchers signaled the subjects, but if I remember correctly, the subjects would communicate with researchers primarily through eye movements. I can't say if the methods are related at all, but the book is worth a read.