This time-lapse video, taken on the night from 23rd to 24th of May 2010, shows one full night from before sunset to shortly before sunrise. If was taken just outside the WIYN telescope at Kitt Peak National Observatory, 50 miles west of Tucson, AZ. Viewing direction is to the north east, facing the mighty 4m Mayall telescope and a range of smaller telescope along the mountain ridge.
The flickering at the beginning is caused by changes in the exposure time by a factor of ~200 000 to compensate for the decreasing sky brightness as the night sets in. The reason why it does not get really dark is the nearly full moon that significantly lights up the night sky. Once the moon has set about 2 hours before sunrise, the Milky Way becomes more prominent, but so does the light pollution from Tucson and its surroundings (to the right of the 4m) and Phoenix (to the left, thanks to Jerry Scott for pointing this out). Although Tucson is at only half the distance to Phoenix, due to its regulations Tucson causes by far less light pollution.
Astronomical targets to look out for is the North or Pole star in the top left. It can be spotted easily as it's the only star that is not moving as time goes by, and so is the only real fix-star in the sky. In the second half of the night you can also see the Andromeda Galaxy, a galaxy very much like our own Milky Way at a distance of 2.5 million light years, as fuzzy, elongated object near the right border.
Technical info: All ~ 1000 frames were taken 35 seconds apart with a Nikon D300 at 18mm and exposed for 30 seconds each.