Showering at night may be the worst common place idea I've ever heard. I have to take a shower in the morning not matter what to 1. wake up 2. not feel like a dirty homeless person all day. There's been times when I've gotten home at 3-4 in the morning from a concert or something and taken a shower, woken up a couple hours later and showered again. If I don't shower in the morning, boy, my whole day is in a funk.