Having the bedroom completely blacked out is inadvisable for people like me. I'll sort of wake up thinking there's something i need to do, fall out of bed, and after a minute or two blundering about realise what I'lm busy about is part of a dream, so I roll back in and sleep.

Pitch black and it all takes longer, and I'll likely break something, maybe myself.

My impression the real trouble with insomnia in most cases isn't the lack of sleep, it's worrying about the lack of sleep. Lying there and taking it easy is the biggest part of sleeping. The thoughts going round in your head would be doing that if you were asleep, just let them go round on their own.