I have noticed that my MacBook Pro goes to Hibernate (Deep Sleep) frequently. Specifically, when I sleep it overnight, if it is low on battery, say 10-15% or less, it'll wake up from Hibernate instead, taking 30 seconds. Hibernate, just to explain, is when the Mac saves the contents of the RAM (the computer's memory) to the hard drive. While this is nice, it usually only happens when you run the battery to 0%...AND it sits for many hours. The MacBook Pros have some power management issues, as well as many, many other manufacturing, quality and design issues. This one is minor, since it's only a few extra seconds, and I didn't even bother to write Apple about it. Just thought I would throw this in there to see if anyone else has seen this Hibernating bug. Again, it's no big deal. Hasn't seemed to muck anything up, just takes a few extra seconds to wake up some mornings. My guess is there is some firmware/software bug with calculating remaining battery life properly.