I haven't had a lucid yet, but people talk about the things you can do in them and how your brain can construct almost anything in this mode.

I have a question though: Does creation require a better than average memory? I'm talking about when you get into the dream. For example: If you want to create a person you know right in front of you (or however it's done), must maintenance of that creation rely on your brain power or do they go on auto-pilot after a while?