Re: music
Being “in the other room”, and barely able to hear a song; where you can just hear partial components of a rhythm; and maybe some semblance of melody; and very slight whiff of timbre here and there – but for the life of you cannot identify the song – this can be an amazing place.
If just low enough, you can build your own diverse melodies, full rhythms, and grand integrated solos of your own design. The source, if you want to go identify it, usually turns out to have been a corny old classic rock song, but in your mind you’ve somehow been enabled to create a self-styled grand “masterpiece”; but – like a dream – you have to quickly get it down on paper or recorder or it will be lost.
Same thing for movie scripts. Daydream exotic situational heroics, and then sketch iconic scenes. Moves are flowy structured daydreams anyway; the good ones.
It’s not about the dreaming, it’s about the capture/translation. I find that’s the “hard part”.