DISCOVERIES: All Night Streetlights

I'm not sure I ever knew that streetlights in my town (and all towns, I guess) are kept on all night long. This morning I did my daily exercise hiking up and down the hilly street near my house, and, at 5:00 am in the total darkness, the streetlights were shining brightly down. Nice to know -- that while we sleep, the streets are lit up all through the night hours to keep things bright and safe.