[thret]

"1. Sleep In A Pitch Black Room Why: Before the light bulb the only lights at night were the stars and the moon."

"2. Simulate The Sunrise/Sunset With An Alarm Clock Why: Humans have evolved to wake up with the sunrise and fall asleep with the sunset. It’s only been the last 100 years or so, basically once the light bulb started becoming common in households, that the natural balance of the sleep/wake cycle became decoupled from the sun."

Humans haven't been without fire, candles, lamps, and artificial light for perhaps 400,000 years. We have evolved with artificial light, not without it.