Can't sleep? You're not alone.
"In times past, human activity naturally downshifted as dusk signaled the approach of night. There was no push to get home, since most people were already there. As daylight gradually receded, the world quieted and the chirping of crickets and trilling of night birds began, as all things darkened, slowed, and cooled.
In modern times, however, as dusk approaches, night begins with “the rush hour”—a massive, noisy, grinding, smoky movement of people and machines. Automobiles, buses, trains, and planes shuttle hoards of people from places of work, school, and daily activity back to their homes. Lost in this bustle, we typically thwart the onset of night." Rubin Naiman