I guess I understood the claim to be universal, that is that all dreams are constructed purely at the point of waking. If it is not, then what I said is indeed

I guess I understood the claim to be universal, that is that all dreams are constructed purely at the point of waking. If it is not, then what I said is indeed not good evidence for the negation of the claim. However, the possibility that some people dream for real while others simply construct faux memories on the point of waking up seems very stretched to me personally. If you're asking about specific individual experiences, I've personally experienced people talking in their sleep about something, then waking up and explaining what it was about, with perfect consistency. I've also experienced this myself (having other people witness me doing so).