It truly baffles me how companies continue to screw with shift patterns when they can be made mind bogglingly simple!
A friend of mine is a Nurse at Great Ormond St and was doing 2 days, 1 off, 2 nights, 2 off 3 days, 2 off, 2 nights etc etc. Just crazy. Keep all teh days and nights together so that you can get them all done in one block. That way you don't have to flip your body clock 24hrs every few days.
My pattern is 4 on, 5 off, 5 on, 4 off, 5on, 5off. Thats all days. Then i do exactly the same but nights.
What it means is that i get a whole month between having to do a full 24 hour body clock change, I get 4 or 5 days off after every run of shifts which is MUCH better than only doing 2 or 3 in a row and getting 2 or 3 off as it actually feels like a break and ultimately, its easier to do 5 nights on the bounce than 2on, 2off, 2on simply because once you are into a night routine staying in it is easier than getting out and back in again.
My industry revolves around people doing shifts and i've tried most of them. Nothing come close to this one.