I know that I read you are suppose to have at least 3 hours of sleep before temping. My situation is that I have to get up with husband at 6AM then again with DD at 7:30. The 6AM is a rush around to get him out the door at 6:30. I was thinking of setting the clock like maybe 6AM. Is this ok to do, if I am going back to sleep. Will the temp be correct? Sorry never done this before...