I'm not sure if medical students just don't work overnight at most places, but I'm always surprised when I ask candidates during interviews about what they perceive as negatives of EM or why EM docs burn out, rarely do people mention the shift work. The perception I think of many students is that because EM is shift work, it should be easy. Less time in the hospital = easy. I'm not sure if its just that students rarely have to work night shifts, or if its that because they are younger, they don't experience what shift work does to you physically starting in your 30's or so.
That being said, I'm a nocturnist. But I've always been a night owl, and while I'd rather work easier hours, I MUCH MUCH MUCH prefer having one shift as opposed to the shift work sleep disorder you get with having your shifts bounce all around. .