BBT temps at different times

Amy

Hi there

I always wake up in the morning around 4 - 4:30am for a toilet break so I take my temp then but for the last few days I’ve been waking up at 3am.

How do I make sure to do it at the right time every day if I can’t just try to get back to sleep for an hour? I’m assuming laying there awake will make my temp go up too.

Amy