Which is more important/accurate for BBT?

Question

bbt?" /> I've searched for this question because I was sure someone had answered it before but I found lots of conflicting replies..

I work nights (12hr shift plus an 1.5hr commute) 3-4 nights a week. I have been temping same time everyday but I've been off for two weeks. Now I'm going back to work and still wanted to know if I could temp on those days as long as I slept for 4+ hours..

Answer

It needs to be the same exact time everyday....even on days that you're off of work.

Answer

Thanks for your help! 
Here is what FF says about it: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. "

Which is more important/accurate for BBT?

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