Good Advise Aussiegirl777. I too like you Rooey5 am a shift worker working mornings, evenings and night shift and I find my temperature is the same or very similar no matter when I take it during the day even if I have being awake all day. Obviously I record the reading that I do first thing when waking but I have noticed my temperature is the same even hours later when I have being up and about so if you are like me then hopefully there will not be a big varient in your temperature at different hours in which you might wake up.