Welcome!

You can definitely chart, even if you sleep at different hours. Do you have a subscription to Fertility Friend (or another charting site)?
Here is some information from Fertility Friend found
here about working different shifts:
Quote:
Shift Work
It is not impossible to take your BBT if you work shifts, but it will be more challenging. Take your temperature at the time you wake up when you are most likely to have had the most sleep. Be as consistent as you can. On your days off, take your temperature after you wake up as well, even if it is at a different time. Make a note on your chart of changes in your waking schedule. You may take your temperature in the afternoon before you go to work if that is your usual waking time and the time after which you are most likely to have had the most sleep. It is not useful to take your temperature when you are already awake and active.
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