Some things you don't know people need until you're directly affected. For me, it was an injury related light sensitivity that made me realise dark mode isn't just a frivolous addition for looks

May I interest you in my doctorsensei.com/how-to-get-off-the-internet.html page?

tl;dr Use dark mode and set f.lux (or the equivalent) to Cave Painting. Helped me out a lot