It's pretty hit and miss at that hour, as someone mentioned...or miss and hit, to be more accurate.
That said, I have tried it myself and lucked up once or twice and found someone who was up after midnight, and even have had a couple sessions that happened in the wee hours before sunrise.
The best part about getting it on at that time is thought of you two banging while most of the rest of the world is snoozing away, though I'm sure there are one or two exceptions in every neighborhood in America