> I also noticed that I had to force myself being productive at night as my executive function wasn't quite there - it was like my mind was used to doing nothing consciously at night, an unconscious part didn't really see a point in being awake and doing things at night - so I mostly just was sitting there, contemplating or meditating. When I made a todo list it was better.

Very interesting. I wonder if this helps to explain why I'm not all that productive when experiencing insomnia, even on the occasions when I say "okay well if I'm gonna be wide awake, I'm gonna get some work done on xyz"