[JivinJeffJones]

I've heard and read that new research indicates it actually could be largely genetic whether you're a morning person or a night person. Some links (though I don't know how reliable the sources are):

Reset your body clock: not a morning person? Your genes have a lot to do with it, but there are ways to change your night-owl or early-bird habits to accomplish more each day Shape - Find Articles
Preference for night or morning might be rooted in our genes

And here's a quick, fun, probably meaningless test to play with.
BBC - Science & Nature - Human Body and Mind - Daily Rhythm Test