I'm working full-time (40 hours a week) while taking 2 post-bac pre-med classes in the evening. It's a bit overwhelming in the sense that I don't really have any time to myself. I get up, come to work, then after work go straight to class. By the time I get home around 9:30, I'm exhausted and it's time for bed. Thankfully though, my day job is really easy and I can study a lot during the day (or, um, spend a lot of time on SDN). 😀 My grades suffered a little bit last semester (nothing tragic, but I didn't get my desired A) because I wanted more of a social life than my schedule allowed me. Consequently, I often opted to go out when I should have been studying. I suppose I felt kind of cheated by my schedule and wanted to claim some time back for myself, to my ultimate disadvantage (well, at least that's my pop psych analysis and I'm sticking to it). I'm going to continue with the full-time work-part-time school schedule until September. Then I'm going back to school full-time to finish the rest of my pre-reqs. Hopefully, I can get by without working. Aside from the time I spend studying, working this job just feels like wasted time. It's not at all healthcare related.
Also, I just wanted to add my $0.02 about working in a lab during ugrad: DO IT! If you decide to take a year off after school, you can easily get a job as a lab tech at a university or a hospital, especially if you have a bachelor's in the sciences. I wish I had worked in a lab instead of in an office during ugrad. Then I could have gotten a job more related to medicine instead of one sitting in a cube.