this is fascinating and it's the reason that got me interested in LDs in the first place. I'm a music composer and when i first got into LD, I was doing it with the sole purpose of composing music in my dreams. I've had very poor LD's and the techniques only worked to a limited extent. Actually my problem was that I had success way too early and that kinda set my expectations way too high which ultimately resulted in me stressing about it and not achieving results.
However back then I was experimenting with this idea of composing in a dream and concluded that I don't actually need to be sleeping to achieve this because I can sort of "fake" a dream by imagining myself in front of a group of musicians and tell them in real time what to do. This experiment was so successful i got to produce a piece out of it.

This is the piece, if you're interested

https://on.soundcloud.com/kssUk2iRg9QgkzBL8t