Found this ladies. Not sure if this will help.
It is important to take your temperature immediately upon waking. Your temperature will fluctuate once you are moving around. If you wake up during the middle of the night and you go back to sleep and get at least three additional hours of uninterrupted sleep, your temperature will be accurate. If you wake up less than three hours before your normal scheduled waking time and have to get up for any reason, it is advisable to take your temperature then (before you get out of bed) and not at your normal waking time. Remember log the time temperature was taken and make a notation as to the adjustment.