Since colleges in the U.S. are now on Winter Break, you can find an AV run fairly quickly at all hours of the day. The drawback is that the BGs are populated with college (and to a lesser extent) high school kids.
Remember the old EDS commercials about herding cats? No? Here's a reminder:
That is what BGs during Winter Break are like.
All the more reason to find a friend and group up with them, even across servers. Even in as big a sprawling BG as AV is, a group of three working in concert can be enough to turn the tide.
Now, who among my WoW friends gets up waaay early or has insomnia? Hmmmm.....