What does 'Usage' really measure?

I just completed 2 experiments. Both cases I let a fully charged phone sit unused while I slept and checked it in the morning. One time had WiFi enabled, the other had WiFi off.
With WiFi on, the phone logged 2hrs 33mins of 'usage' during 7 hours of standby while I slept.
With the WiFi off, the phone logged 1hr 10 mins of usage during 7 hours of standby while I slept.
I have this intermitten problem where the phone 'turns itself on.' That is, the 'slide to unlock' screen is displayed when I don't touch the phone. This is intermitten, and sometimes is like a 1/10 Hz stobe for 5 mins, and sometime doesn't do it for an hour (and so, I can't convince a 'Genius' that anything is wrong). This is a 5 week old phone in pristine condition. I noticed these symptons about 10 days ago.
What's going on here? What does usage really measure? Can it be measuring the amount of time the phone has turned itself on, or something else entirely?
Please advise, Thanks,
Gravity Mike

Thanks for the comments. I do not have any auto-checking enabled for my email, I always check manually. I'm not sure of any other background tasks that could be happening.
I do find it interesting that somebody else has seen the screen 'wake up' without touching their phone. I'm not sure, but this maybe happened with that latest rev - or whatever is broken seems to have happened at the same time. What I noticed first was shortened battery life, then the screen flashes, then the unexplained 'usage' time. Maybe I should try going back to 1.1.2 (but I love the home screen customization feature, I have traffic and weather radar with one button push!)
I hope this is a bug that can/will be fixed and not a hardware error. I'll keep observing.
Cheers,
Gravity Mike

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