When i was on a QDS regime I still had my Levemir at night and bolused with any food that I ate during the night shift. To be honest, the main problem I had was returning back to a daytime routine, that whole jet lag experience made my BMs go high and I would spend a couple of days chasing them.
Its easier now I am on the pump, but still have some problems in returning back to days.
(I did also make the mistake only ONCE in giving my levemir dose at about 10pm just after handover finished but after giving 34 units, realised it was actually the novorapid. Ended up spending that shift in A&E)