Which bit is concerning you?
The start and finish times, the rest time in between and the actual shift pattern. Unfortunately I don't have a body clock that can quickly adapt. A start time of 04.00 would mean having to get up at 03.00 latest which quite frankly sounds dreadful as I know I wouldn't be able to get to sleep. I'm not the sort of person that can just sleep on demand and get to sleep as soon as my head hits the pillow regardless of how early it is. Now this wouldn't be so bad if I were on this shift for a long period of time because I could adapt to that and get my body clock into a routine so that I was able to get to sleep at 8-9PM and get sufficient hours sleep. However I have a feeling that this isn't how it will work and instead there will be constant weekly chopping and changing from early starts to late finishes into the early hours with only 1 or 2 days rest in between making it impossible to get into any kind of routine with my body clock. To me it would make more sense to have a system whereby you do say 3 monthly stints of a set shift. For example 04.00 - 13.00hrs and then change to say 13.00 - 21.00hrs for the next 3 months and then switch to say 20.00 - 03.00 for the next 3. At least this way you can get into a sleeping routine which enables getting enough sleep.