https://en.wikipedia.org/wiki/Prisoner's_cinema
https://en.wikipedia.org/wiki/Hypnagogia

Any mental exercises to improve lucidity of prisoner cinemas? One I was trying with some success in laying down was trying to spot numbers in the blackness of my eyelids, I had some success. I get hypnogogic flashes of images occasionally of text and people/places. I guess the goal is to develop the brain to a point where remote viewing is as voluntary as making an apple in your visual space.

I one time remember in a episode where I was sleep deprived and on Adderall, where I was able to conjure this vivid inner space with floral wall paper and doors.