Well, if you're like me, then the later it gets, the more interesting things seem! haha
It doesn't help that my whole family stays up late. I hate to "miss out" and go to sleep while they're still up having a good time, be it talking, playing a game, watching a movie, etc.
Another factor, I think, is that the night time is "fun time" and "free time." Whereas the morning is "work time" and "chore time." I'd rather skip as much work time as I can, and maximize the fun time! Seriously.