Do you have trouble sleeping? How do you keep track of your BBT accurately?

I have been struggling to sleep for months. I didn't think the bbt was worth it but finally gave in and got one. It's super stressful to use the last few weeks all because I can't sleep long enough to get an accurate read. So I measure a few times. And try to pick the one with the most sleep prior or the one closest to 7 am. My selected wake and temp time. What do you I somniacs do to sleep... or how do you measure temps????!!!! I can accept the not sleeping thing if theres a way to get an accurate chart somehow. HELP ME!