In the Periodicals Room, there is only light!
What's the last thing to do before closing the reserve desk? Flip all of the light switches off, right? Nope! Make sure that you only flip the switch with orange tape on the far left; the other light switches control the lights in the whole periodical room, and that stays open as long as Wilson Library is open. On sleepless nights, I have seen the Library after close, and I think the lights stay on through the night. So, as I said, in the Periodicals Room, there is only light!