Back in the day, when I was still actually flying for a living, (okay, may as well admit before Buzzard reminds me, it was more, sort of, back in the last century) I used to love flying at night. There is a beauty to the populated and artificially lighted world, seen from above, that people who live and work on the ground every day rarely get to behold. Really, night or day, one can do worse than earning a living five or six miles above the earth. That part of the Air Force, I miss.
And just so you know what caused this moment of nostalgia, you'll find some stunningly beautiful photographs of London at night, here.