So here is an odd problem -- I swapped out the drive in my new MPB to a Western Digital Scorpio Blue 500GB. I closed the lid this morning and left it unplugged, and the machine went to sleep. I came home later and the machine was off, battery entirely drained. Doh. So I just hooked it up to power and then shut the lid to see what the problem was. Machine went to sleep, then woke up again after it went to sleep. What can cause that? It has to be the new drive as nothing else is changed.