I've heard that about Dali, couple of decades ago, and had forgotten. I used to get complete songs in my head; if i was near my workstation i'd transcribe it as best i could. Usually, though, i was in the car. Lost probably hundreds of songs due to not being at home and not carrying a recording device. I fixed the recording device part in mid-2000s; prior to that i had some real crap for live audio recording.

As an example of both "full song in head" and "crap recording equipment" i present a 25 year old track and also ringtone of mine(1 "F" bomb in the track): https://soundcloud.com/djoutcold/showerbassline

https://soundcloud.com/djoutcold/showerringtone

if you scroll all the way down my track list, there's a track called "greenocide" which is written similarly, inspiration, transcription, then field audio recordings and telephone tap recordings, but much higher quality overall!

You mean hypnagogia?

Liminal dreaming. Ain’t never heard that before, sounds like pseudoscience woo-woo to me.

The proper term is hypnagogia.

https://en.wikipedia.org/wiki/Hypnagogia