I'm a morning shower guy. My parents were always bedtime shower people, and they raised me that way, but as soon as I tried showering in the morning instead of at night at age twelve or so, I couldn't go back. A morning shower just makes me feel so much better. It wakes me up, and I start the day off clean instead of "clean several hours ago." It's a morale boost too.
I don't mind going to bed having not showered as some people do, probably mostly because I will start getting sweaty anyway, regardless of what kind of covering I'm under. My body is an incredible heat source.
I can imagine that this is a source of consternation between any couple involving a morning shower person and a bedtime shower person.
Listening to: The sounds of the heater.