That's fascinating. Do you gain access to facts or knowledge that are verifiable afterwards? Have you ever become fluent in a foreign language for a dream?
In my experience, it feels real but the feelings doesn't really hold up to scrutiny. It's more like the set of a play than a real world, where a thin facade evokes all the right cues in the audience but couldn't actually be used to trick someone into thinking it's real.
Within the confines of the dream? Yes? Outside of the dream? Once I'm awake it feels real for a moment but quickly snaps back that it was all fictitious