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Gemma about sleeping in total darkness
Yes, my husband and I (which makes it a n=2) had very noticeable results by achieving total darkness in our bedroom.
After about a week, general improvement was definite : better sleep at night and calm energy during the day, a complete stop to any night sweats, better mood, and a deep feeing what we were doing was very right. Eyes quite wet upon waking up.
It is not very clear it was only due to this total darkness because at the same time we also decided to change all computer screens to black and white, and stopped using Ipads for reading, switching to e-paper display instead (black and white too). And stopped watching films in the evening. And we changed some of the lights in the house to make sure there was no unnecessary harsh lighting. After dark, we only read books.
We were not really sick anymore, it was just an added bonus.
A couple of months later we started watching films at night again and experienced very rapidly, after three days, a slight come-back of the old problems. So we stopped. It seems that once a week is OK, not inclined to try more at the moment. We don't want to mess up the results of our RS challenge.
Good luck with whatever you are looking for!