Basal body temp.

This question is for all those tempers out there!! 😊 How important is it to take your temp at the SAME TIME everyday? I know you don't take it before you are even out of bed, which I don't. I roll over grab the thermometer and temp. But I have trouble sleeping and some days I'm up at 7:30, other days, like today 5:45. That is a big difference in time but they have always been taken right when I wake up. All research says same time everyday, but what if that's not possible? Could me temping be skewed because of it? I appreciate all of your help/thought.