PER3
Apparently your propensity to be a morning or night person is influenced by a gene called PER3. The two forms of this gene translate into two different proteins, one of which is shorter than the other. Morning people are more likely to have the two long versions, one from each parent. WTF, I must be adopted, my dad wakes up when I go to bed. I was under the impression that maybe Id want to get up earlier when I got older, but I still like sleeping in till noon and I guess this is just how I am. Hmph. Maybe my parents each had one long one short and I just got screwed.