It means everybody has slept in.
Will it work OK as soon as it gets dark again?
It's the cleaning lady unplugging the radar again so she can plug her Hoover in!
etc etc
This is my first visit to ATC issues and I'm delighted to see you're allowed to have a sense of humour on here. I tried a little joke on R & N once and their po-faced mods had it deleted ASAP and I was told to save that stuff for Jet Blast!