I would say it depends. Some people (like me) can stay fairly clean at night, whereas my Dh really can't - he sweats in bed at night. And even if you can stay mostly clean overnight, there are still parts of you that may need freshening up to the point that you might as well hop in the shower, even if only briefly.
Personally, I shower in the morning b/c I need to wash my hair before I go out anywhere - it gets limp and out of shape after I sleep on it. I will only shower at night if I've been unusually dirty or sweaty, then I still shower in the morning unless I'm just staying home. DH showers night and morning.
OP: I don't think either of you can make a blanket statement either way!