Yeah- I agree with supcom... the natural high is so much better than the artificial. Why depend on an artifical enhancement that you'll either become accustomed to and your body will adapt to when you can just go with your body's own hormones instead? Taking the artificial stuff may end up doing more harm than good, because when you start getting used to the stuff, eventually, either you have to up the dosage or find something new to give you that edge.
I'm not a morning person either, but I think what you just need is time to get used to the idea of waking up early every day- I get up at 3:45 most mornings to do my rides, and although it's not easy still, I am used to the idea of getting up early. Besides, once that cold air hits my face, I'm WIDE awake!
Just my 2 cents.