Taking BBT while on vacation

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So, I just recently started tracking my BBT and have been doing it when I wake up to go to work every morning at 5:30. I'm now on vacation for a week and in a time zone an hour behind where I live. My question is: if I don't want to miss out on a week of tracking, do I wake up simply to take my BBT at 4:30 local time and go back to sleep (because half of vacation is needing to sleep in of course!)? Or will that mess it up?