The missus and I just finished night classes for our CCNA. 32 weeks, Tuesdays and Thursdays at night. Go for it, it is a blast to be back in school!
If you do find some classes you like/need at night, let the instructor know what you are looking to get out of it. Often, they a re looking to expand the night courses and just need confirmed seats to be able to convince the registrar that it is a viable (paying) option. That is how we got CCNA 3 and 4 classes at our local CC, by signing up for 1 and then agreeing and signing up (and paying) for 2,3, and 4 as soon as they offered. Where else can you get all training, Cisco certified with live instructor, for $450 - $500?