I used to be a night owl too. Actually, can't remember a time when my biological clock doesn't give up till the sun comes up. Then I got tired of the judging and the just endless freaking nagging and purposefully turned it around to shut someone up and make a point.
Now I sleep at around 6 to 7pm-ish and wake at 4 to 5am-ish.
But honestly that just means I'm reverting back and living to the Pacific Time Zone before I moved to Taipei, where I sleep at 4am and wake at 2pm, west coast time. Bottom line: I can't fit in with the regular folks, wherever I am. It's a subconscious thing I guess. Suspect my brain doesn't want to feel like a sheep, or zombie.
Either way I'm sure there's a perfectly logical medical explanation for all this, such as having something to do with the circadian rhythm:
Frankly people, unless you have a strict 9-5 job or something in that line, there is NOTHING wrong with choosing your own bedtime according to what your body is most comfortable with, as long as you end up getting enough rest for your brain to unwind.