After I wash dishes in the sink, I take the water out to the yard - not to be green, but because I am cheap
When I take a shower, I turn on the water enough to get me wet then turn it off. I turn it back on to rinse myself off. I do this too because I'm frugal. I learned this technique while using public showers at Talladega at a NASCAR race. (very cold water!)
I also swim in our pool and count that as taking a shower at night since it is kept free of contaminants via chlorine.
I just don't like to waste -- electricity, water, gas, possessions, even people. Of all, people are the worst thing to let go to waste. I kind of wish people cared more about people. That's another topic.