BBT question - can you help?

Becca • RN, mama to two daughters, recurrent pregnancy loss survivor, 🌈 baby # 3 on the way
This morning I woke up at my usual time, 5:30. As I often am during my luteal phase, I woke up hot and sweaty (oh says "like a furnace"). Typically when I feel like this my oral temp is 98.30 or higher. 
​Today my oral temp was 97.79. I was surprised, so checked under my armpit. That temp was almost the same, 97.56, then I added the degree to adjust it and it gives me 98.56--which is where I expect to be for this time in my cycle, and is reflective of how hot I felt this morning.
​Any insight into this? Would unknowing sleeping open-mouthed cause this? Any reason I would feel really hot but have a lower temp?
​Thanks! 

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