BBT???

Hey, glowers!(Yeah, I made that up) So, my doctor recommended I take my bbt and explained to me how to do it properly. However, after two weeks of taking my temp the moment I wake up(most of the time I don't even remember what it said and have to turn it back on to see the reading) my temp goes up and down a degree every day. I have PTSD, and it seems on the days I have night terrors my temp is higher. Does any one else have this problem? Have you found a better solution for checking your bbt? Thanks, ladies! Baby dust to all! <3