The Light Doctor is coming to Substack

And a lot of people are going to change the lights they use

For most of human existence our ancestors lived with the natural 24-hour light-dark cycle, spending each day in natural daylight and sleeping in the dark at night. But since the widespread introduction of electric light, approximately 90% of our time is spent indoors¹, under unhealthful and human-unfriendly electric light, which disrupts our circadian cl…