Seriously? I don't go out partying/barhopping all that often, but when I do I'd say I stay out to three or later about a third of the time. My body also doesn't do hangovers ;) And I believe I'm older than you.
Leaving a houseparty at 3am and finding the trains have stopped running. It's been a few years since I've done such a thing. Besides, this is Chicago. Everything closes early, unlike NY, so there is that creepy deserted streets feel at 3am.
How old are you? (I'm 33)
"Pretending that you already know the answer when you don't is not actually very helpful." ~Migeru.