This is the best time for the board. None of the "commentary pumpers" ('smack that ask', 'here we gooo') are here, just all solid posters who are presenting substance in all their posts (whether it is answering someone else's question, refuting a basher, or just simply making a comment). To me, this is the best time to learn (which is KEY for me since I am a newbie) because there isn't a ton of worthless drivel being posted, and when there is, it is "taken care" of in a factual manner.
All in all Kudos to the late night posters who bring substance and reasoning to their posts. From a newbie, it is really appreciated.