What's your problem with the links in that chain? We know (or, at least, papers argue...) that all of the linkages are true, and I (post author) link some stud

What's your problem with the links in that chain? We know (or, at least, papers argue...) that all of the linkages are true, and I (post author) link some studies that look at the end-to-end results - blue light vs sleep. With what I consider to be fairly straightforward results. I write having spent the last few months testing exactly this sort of thing in my life. Nights spent with LED lighting, or LED lit screens, I take a long time to fall asleep. Nights spent on incandescent lighting (lanterns or bulbs), I fall asleep quickly. It matches the results of the papers I've linked, and I'm pretty sure "Reading a book on paper by lantern light" vs "reading the same book on Kobo by frontlight" is the same mental activity.