[Quiet Man Cometh]

No, no they do not. I find my brain works best at 2 am (probably because I forced it to), but then, I was an english literature major and I can write english papers without too much effort most of the time. It was the other stuff that tripped me up on occasion. Tip: do not write an exam with a stomache ache, especailly when said stomach ache prevented one from studying for said exam.