I think it exists because it's a concise way to communicate "this is ending, and will end in a predetermined amount of time, but it has not yet ended" in the same manner that sunset indicates that a day is ending but has not ended yet.
30 karma · joined January 7, 2012
Ah, but you can also try to get the computer to 6 ;).
edit: might as well link my repo, which doesn't yet include that functionality: https://github.com/drewfrank/dotfiles