Can I take BBT then go back to sleep?

So I wanna start tracking temp but I was wondering can I take my temp then go back to sleep? We are working from home at the moment due to covid but usually on work days I get up at 5.45, so I wondered should I start temping at this time as this is when I’ll be getting up in future and want to keep my timings regular. At the moment I’m waking up at 7.45 so I go back to sleep for 2 hours

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