I feel that the "What's In It For Me" rationale only goes so far. My experience has been that day students are more interested in career objectives while night students are more interested in establishing an academic foothold -- which is to say, they want a degree that they think is attainable.
I don't mean to generalize, but as a percentage of total population, I feel that this observation holds true, at least in the Film and Media program. More day students take notes and ask questions. More night students take naps and are anxious to leave early. Classes appear to be necessary evils to them. If they could test out, they probably would.
I would be interested to hear other instructors' observations.