Closed my charged MBP, opened later - battery dead...

I opened my sleeping MacBook Pro 2.0GHz last night and used it for a few minutes. I noticed the battery was mostly charged. (Not plugged into AC at the time.) I closed the screen and walked away.
The next morning (12 hours later) I opened the unit and it did not come on. I looked at the bottom and saw one flashing light for the battery meter. I gave it AC and tapped the power button and it restored from disk-saved sleep state and was back.
The battery fully drained itself thru the night. The bright white flashing sleep LED was lit when I saw the closed unit later last night.
This has happened once before.
- Did the unit wake and run down the battery?
- Was the LCD screen lit, while closed, until it died?
Anyone seen this behavior?
blakespot

I've had this happen to me a few times too.
Very annoying, because it makes me lose confidence that I can just shut the lid and come back to the computer later and continue my work.
This is almost Windows like (Windows notebooks have a notorious problem with sleep and waking properly without crashing) !!
I don't remember this problem with my Powerbook - the reliability of the sleep was one of the truly satisfying user experiences, never having to reboot OSX and having an instant on internet experience at home.
I'm wondering if it might be related to the hibernation feature that is implemented in the MacBook - you might have noticed that it takes 20-30 sec for the hard drive and fans to stop after closing the lid as an image of the memory is stored on the hard disk (for just in case the power runs out or the battery is taken out).
I don't like hibernation, because like most people after I close the lid of the computer I want to put it away and this 30 seconds is a critical time with hibernation for hard disk damage as 2 gig is being written to the hard disk. Any knocks and bumps could be catastrophic.
I'm going to turn of hibernation and will follow up whether the battery dead with lid closed problem continues.
Problem is that it is intermittent.

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