PhotoperiodEffect.com

16. Maybe some people are affected by “too much” light, but I'm not one of them. I can sleep with the lights on and it just doesn't affect me – and I know my body best.

None of us is superhuman, and as has been discussed at length above, most of the harm light does won't cause any pain or discomfort, or won't show up at all, for years (if not decades.) So (heaven forfend) you may one day have the leisure to read more carefully what I've written above about lagtime, etc., from a reclining position in a sickbed or even a hospital bed. You may then conclude that your body and its hormonal system actually aren't all that different from everybody else's. Of course, your individual genetic heritage will strongly influence what goes wrong first, and when. Some individuals will even experience less harm overall. But we are all harmed, and the first sign of any problem may be a severe stroke or diabetes. The time to stop gambling that we'll be okay, even if so many around us are coping with chronic illnesses, is today. Even if all you manage to do by taking the advice here is to delay the chronic illnesses that old age eventually exposes nearly all of us to - such as heart failure - by say, ten or twenty years (and I think the evidence already in shows that on average the benefits to human health will be much greater that that) – that ain't nothing. At a very minimum, please strongly consider taking the advice given right at the start of the reply to objection no. 5 here - stop turning on any lights when you head to the washroom at night (and use a red flashlight/red LED “2 function” bike light instead.)