I'm not sure I know the words to describe them, especially since the memory fades quickly. My next step is to start writing things down immediately afterwards.
I do remember in one HTLO accompanied session that I was at a campsite with my family and could hear Tomhet in the background. There wasn't anything fantastical about it, but since it was in a forest and dark I'd like to think that was some way Burzum inspired.
many times it's not that much because memory fades away as because threre are not words to describe many dreams: at first "sight" into your own remembering it's looks like easy to explain, until you try to put the dream into words, either talking or writting, and you find you can't.
Another thing: music can carry dreams with it, but usual noises while dreaming can induce a musical dream, even the fuckin' knocker-up, I swear; I guess many of you have experimented this too.