I once experimented with beeswax candles as my only after-dark light source. This meant no hyper-stimulating screen activities whatsoever, too. TV, phone, video games, browsing the web? Nope, nope, nope, and nope. Just dim, warm light from actual flames.

Cured my lifelong “night owl” “trait” in a couple days. Shockingly effective.

Turned out to be hard to keep up and still, like, exist with other people, and you’d probably need to relax it a little in Winter unless your job lets you work reduced hours to kinda “hibernate” (otherwise when would you do anything that’s not work but requires light or electronics?) but it sure worked.