Humans have been staying up late next to a bright light (fire) for longer than we've been Homo sapiens. Considering humans have unique physiological adaptations

Humans have been staying up late next to a bright light (fire) for longer than we've been Homo sapiens. Considering humans have unique physiological adaptations to smoke (heavy tear and mucus production) I think it's plausible that our circadian rhythms also adapted and aren't quite as sensitive to red/yellow light as other primates. Blue light, however...