Even if the room is dark, there is always a light outside the window and someone lights it up.
When I was losing my sight, I hung up the curtains so that when I woke up in the middle of the night, I would immediately know that all was not lost and that I could see the light and tell myself “don't be afraid”. I got calmer and fell asleep until morning, and in the morning I had daylight and strength to move on.
I finished the film after the video was released on Onliner; the lights outside the window were huge support from caring people).
My mind was getting lighter and lighter, and even without vision, it wasn't easy to use a lot of black.