I'm mostly a late-night person. My sleep rhythm has shifted about an hour or so earlier after I decided not to use any artificial lighting in the evening. Not j

I'm mostly a late-night person. My sleep rhythm has shifted about an hour or so earlier after I decided not to use any artificial lighting in the evening. Not just avoiding blue lights -- I don't use any lights in my room at all (except a very dim one when absolutely needed). Of course, I still have a bright light source from my computer screen, but avoiding using other lights in my room did help. I guess it also depends on where you live, sometimes natural lighting can be counter-productive if you live in high latitudes (not an issue for me), in which case maybe sth like "no lights after 6pm" might help. As I said, it only shifted my biological clock for maybe an hour or so, which is a significant change but isn't a panacea. Hope it helps.