What is Wake Up time? Know I'm awake or get out of bed?

Hi Sleep as Android community,

Long time user with a nagging question: what is Wake Up Time? Is it the time I first awoke in the morning, or the time I got out of bed?

For example, I woke up at 6:30 am today before my 7 am light “alarm,” but went back to sleep until 8. Does your answer change if that addition 1:30 was un/interrupted?

Thanks for your thoughts!