Which temp do i log?

Renae

I track my bbt at 5:30am everyday. But this morning i woke at 4am. I didnt get out of bed, tried my hardest to go back to sleep but unfortunately had beoken sleep until 5:30. I quickly took temp at 4am which was 36.52 and then my temp at 5:30 which was 36.76. Which one do i use?