4 ms·

You said "being exposed to bright light late at night is nothing new" which is demonstrably false.

• ekianjo 12y ago
  No, a petrol lamp was bright enough to read at night and study way longer than what the sunlight could bring you. I'm not sure what you are trying to argue with - do you think modern society just started 120 years ago only?
  • minikites 12y ago
    "Bright enough to read" and "bright light" are very different, that's been my point since the first comment. We've had "bright enough to read" for a long time but only in the last 120 years has it been possible to have actual "bright light" late at night.
    • ekianjo 12y ago
      We are not arguing about the same thing then ? My comment was specifically about the fact the day-light cycle had been disrupted for a very long time in human existence already. Not matter if lights were dim, using a petrol light after dark is already disrupting that cycle. Or do you contest that?
      • minikites 12y ago
        I am, because if a dim petrol light disrupted our sleep cycle, we would have seen sleep cycle changes sooner than 120 years ago. Instead they're correlated with the spread of electric light.
        • ekianjo 12y ago
          But there's ample data in literature about people doing stuff at night even back in the Middle Ages. So now, explain me - if people were sleeping later at night instead of sleeping as soon as the sun goes down, how did that no impact their sleep cycles?