In terms of a proper non *** reply:
Remember that the section of Bioware that made this game is housed in Austin, TX, which puts them in the CST time zone (-6:00 GMT). They're going to time stuff around their own down times (i.e. early morning in Texas).
All servers must go down at the same time, because they're not going to allow servers that are NOT for the Test Realm to have different versions of the game out (i.e. patch at different times).
Because of this, while it's a less than ideal time for you, it makes sense for where they are at, and the desire to have the same / similar experience across servers / locations means that EVERYTHING comes down at the same time.