There is a total different feel for night games. I've been to several Big XII conference night games and its a totally different atmosphere then day games for either the Big XII conference of MWC. There is much more enthusiasm, built-up excitement through the whole day, better tailgaiting, and generally a louder stadium.
Keep in mind there are tons of students at UW who will sleep in till 10 or after on Saturdays so are still just waking up when they get to the game. I imagine if we get back to at least one night game a year we may find it hurts attendance for the season ticket holders who then have to spend the night in Laramie but it will help on the student attendance and associated noise level in the stadium.