That's right. That may a holdover from our agrarian roots, when people had to get up early to milk the cows or work in the fields before it got too hot. It's be

That's right. That may a holdover from our agrarian roots, when people had to get up early to milk the cows or work in the fields before it got too hot. It's become institutionalized in modern society ("9 to 5", schools scheduled in the morning and early afternoon, etc.)