Just before 11PM local time, my computer has awoken for no known reason, until today.
It turns out that the Windows Media Center updates at this time. As far as I know, there is no non-nerd way of changing when this happens.
Luckily I consider myself a nerd! Unfortunately, I'm not nerd enough to know how to go change this!
I would really like to adjust it 12 hours [forwards or backwards doesn't matter to me if I have to wait an extra 1/2 a day for updates] I think it would be better if it updated while somebody was using it as it has 8 cores, nobody should even notice.