Wow, it is okay to just have it in sleep mode all the time? I want to keep my battery life as strong as possible, does this not cause you to lose charge over time? I've only had mine a day and a half. Charged it completely, used it down to about 40% throughout the day yesterday and recharged it overnight. I have always shut it down when I'm finished using it, but it would be nice not to have to as my MBP goes EVERYWHERE with me and it would be really nice to just open it up and be ready to go. Of course, coming for years of PC use, this thing starts up from being completely off quicker than my PC could wake up!