BBT, Timing and Night work!

Sophie

I'm thinking of starting temping. But I work nights. I work 11pm til 7am 4 times a week. When I'm at home during a night I would normally wake up for 7ish for my son. So I'm struggling to find a simlliar time everyday.... Does it have to be the same time every day?

I've recently bought a thermometer which you wear when your asleep if that helps?