In Berlin I did a lot of nights, you did seven 12 hour shifts, but had the next week off.
I was the ICU person, did 17 nights in a row with a patient who should have died, and nearly did several times. He was amazing, on one occasion he asked me to speed up his blood transfusion as his vision was dimming.
He came in with hepatitis, then developed an abscess over his right kidney, then a stress ulcer which perforated, then a DVT. At one point he had blood going in from four sites, and it was coming out faster than we could put it in. I think we bled every B+ soldier in Berlin.