This is my FIRST time tracking BBT and already I don’t understand.

My issue is... I have real bad insomnia, some nights I get like 3-4 hours sleep max and it’s pretty much ALWAYS interrupted.

Can anyone shed any light on this situation? I did an OPK which confirmed I was supposed to ovulate when glow had predicted, but I didn’t get a huge spike in my temp? And it’s already gone down this morning.

Trying to do it at around the same time each day (8am when I wake up) but sometimes I’m awake between 5-6:30 struggling to sleep, so is it not going to be accurate?