This girl (not a pianist) claims to write all of her music while lucid dreaming, with full retention, brings it right to the studio and tracks it after.
I got a superb idea! Let's all claim we are somehow eccentric with our creative powers and then let's use it to promote ourselves commercially.
Anyway, I checked the site, the "dream music" section, gallery (made me crack up) and music samples. The last section (supposely the highest priority, eh?) was especially funny after all the mysterious and enticing (some people would just call them flat) descriptions of her oh-so-potent dreams.
Regarding the topic itself, I do "dream music" but it doesn't require the sleeping state. Actually the best moments in creating music "on the fly" have occured in between waking and dream state. Somehow when we've shut ourselves from the exteriour world well enough we're able to flawlessly communicate with ourselves in form of music. Its interesting to think that the most creative geniuses of our history were probably in a similar state of mind constantly. Wouldn't you put everything else aside and start writing it down? Its of course natural for us to think that somehow the power to create is something that one just possesses or doesn't, and those who do get it all easy and free and those who don't will just vanish in between the pages of history. Another thing is to start consciously developing oneself towards this state of mind that so flawlessly allows us to pour our feelings out and maybe into something concretic. That requires determination, and determination requires self-consciousness, which requires self-exploring, which is made possible by being boldly creative, which together with determination results in beauty to be shared with the whole humanity.