[azakai]

> Why: Before the light bulb the only lights at night were the stars and the moon

Seem to be forgetting fire. Campfires were surely used by our ancestors, for hundreds of thousands of years, and it is plausible that we evolved to adapt to them.

> Humans have evolved to wake up with the sunrise and fall asleep with the sunset

Evidence? Are we sure that ancient hunter-gatherers did not hunt/gather by the light of the moon? And after the discovery of fire, there would be even more flexibility. Using fire to hunt animals during the night, when they are most vulnerable, sounds pretty useful.

[barbs]

> Seem to be forgetting fire. Campfires were surely used by our ancestors, for hundreds of thousands of years, and it is plausible that we evolved to adapt to them.

He does lightly touch on the subject of fire:

> The blue wavelengths of light suppress melatonin production so daylight triggers the body to stop producing it (interestingly red, orange, and yellow wavelengths don’t suppress melatonin production and are the same wavelengths produced by fire)