4:18am.
Was fantastic, since I've been waking up at like 9pm recently thanks to a massive 36 or so hour long gaming session with a friend over Xbox Live which messed up my body clock by quite a bit. So last night I forced myself to stay up 24 hours, then go sleep at around 10pm, so I'd wake up in "normal timezone" hours.
It's nice to wake up to light, no matter how partial it was. I like waking up just before dawn anyway, you get the sense that the day is truly yours, instead of waking up when it's already light and feeling like you've missed something.