I read this in Wired today:
Artists, writers, and coders typically fire on all cylinders by crashing near dawn and awakening at the crack of noon. In one study, "evening people" almost universally slam-dunked a standardized creativity test. Their early-bird brethren struggled for passing scores.
I can't even begin to say how much this describes me. The only caveat is that it isn't sustainable. Do it too many days in a row and you will most certainly crash.