Brandie, nice to see you over here!
I work shift work too, but not as difficult as your hours, since some of nights only go to midnight, and only 4 out of my nights a month really effect my temp... not bad but they usually seem to happen around O time when I need them to be accurate!
For me, no matter if I'm working or not, I set my alarm for 6am every day and temp, if I don't have to get up I just go right back to sleep. On the nights I don't get home until 5am, or to sleep until after my temp time, I just go to bed, wake up whenever and temp and mark my temp at the different time.
It's good that you use other signs along with your temps, it def helps!