My coach always before a match pulled me back a bit... he said to me "Do not peak before fight time!"... because, when you peak, your mind becomes stale and you lose your edge. Chemically speaking, you blow your testosterone wad and then you have nothing for fight night.

It's not that you aren't conditioned, cardio-vascular wise and muscle wise, but your testosterone and "heat" will burn out... you need heat for fight night.