Nurse's Assistant?

Hi everyone,
Im currently a nursing student just finishing up my 1st semester. I just recently applied to a job and got a call back for an interview! It's a position as a Nurse's Assistant...(I can't do much without a degree unfortunately) which basically means I'm under the direction of an RN as well as LPN.

I'm just curious... the department I would be in is called the PCU. I assumed it was Psychiatric or Pediatric unit. Wrong. It's called the Progressive Care Unit and I was told it was a step-down from an ICU. Can someone explain this to me? As I was also told from other people it was almost like Telemetry..Also what do you think this job consists of? considering it was an overnight shift I would be on. I will have all these questions answered during the interview of course but it would be nice to have some answered beforehand to ease my mind. Thanks!!