On this AM shift pattern for winters you will see that my basal rate literally doubles..
However, to get my levels right I do one night of tests at midnight, 2am, 4am and 6am and the next night 1,3,5 and 7am. I just do this the week after the clocks change.
I also have a shift for my hubby working pm shifts too.
I also have a rate set up for summer (after clocks change) for both am & pm shifts too.
I would advise doing a couple nights of basal testing as above and also checking your blood one hourly for 3 hours after getting up as well..
I am pretty exact with my testing.... It works for me...others will do things differently....