Before Your Eyes. I was going through some major stuff at the time and I’ll associate the game with that summer forever. It has a very unique mechanic and it ties into the game really well without feeling like a gimmick. Takes about 3 hours to complete, so not a huge investment either.

I personally like fanfiction.net better than AO3, but I believe AO3 is the bigger one

I hope this one is just the right amount of interesting for you. I particularly like that there are recurring characters and you can keep up with, and “cameo” style apearences and references if different episodes. Easy enough to ignore if you’re not into that. My favorites are the baker and the cat Marmelade. Best of luck sleeping!

If you haven’t tried it yet, I’ve listened to “nothing much happens” podcast for years and years now and it helps me fall asleep faster. If you don’t like this one in specific, there’s plenty of the same genre online for you to try. I prefer sleep specific content because the audio does not have any sudden changes or loud noises. Also screens on while sleeping decrease sleep quality, IIRC