Did no one read the OP? This person wants to know if there's evidence to back it up. The only thing anyone's said so far is that it's been 'mentioned' in a book. Everything else has been an opinion which doesn't help at all.
I'm going to take an educated guess and say that the answer is that we don't know. It's one of those fun myths people like to make up and present as fact because it's a cool idea which sounds like it could be true, but we really have no idea. Here's why I think that. We do not know much about how the human brain works, especially something as subtle and complicated as whether we can make up faces in our dreams, so it's unlikely we could determine the answer through neurology. The only other way we might answer is through experimentation. But how would this experiment be designed? It couldn't. To determine whether or not even one face that a person dreams about is one he's seen in real life, the face he's dreaming about would need to be identified somehow, and there is no way to see what other people are dreaming (yet) so that would be impossible. Even if he had a photographic memory or something and drew it out, there'd need to be a list of all the faces the person has ever seen just to determine that the face wasn't one he's seen before, and that isn't reasonable.
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