Agree with all, but in the end shift work is just bad for you health. I did SAR/EMS for ten years on the good '10/14' roster, and my general health and ability to get good sleep deteriorated over that period. I soon realised it just wasn't 'old man's disease' but that the roster that was killing me. Flying rate seemed to make no real difference, and I tried most strategies. In the end I told 'porkies' on the FRMS ( like most do!) and got pretty good at flying whilst totally shagged - and that's not good.
So, I quit and got a better job, and haven't slept so good in years.
On a related topic: the only conclusion that an inquiry into the breast cancer cluster at ABC Studios (Bris. QLD) could determine was that it may have been related to shift work, and the effects of artificial light on melatonin levels.