I am a respiratory therapist and work night shift also, I don't have a problem switching from day shift to night shift. I just eat when I am hungry and when I have a free second. I had surgery on April 13th and I have not had my first fill yet.
What time do you wake up when you are off work? I try to function as a day shifter on my days off. I usually have a light Breakfast, bigger lunch, then a light dinner with some yogurt, cheese or Peanut Butter in between for a snack.