Is it Better (and Cleaner) to Shower at Night or in the Morning?

While my showering habits have shifted since having kids (read: I shower less), I've always been a morning shower-er, purely for practical reasons. My fine hair styles better when I don't sleep on it, and the ritual of a morning shower jolts me awake and helps me mentally prepare for the day ahead. Plus, I tend to get hot at night, and I feel fresher when I rinse it all off in the A.M.