I have recently starting noticing that my MBP comes out of sleep on its own when I remove it from my backpack: i.e., when it is still closed and latched, in my hands. This is making me worry that it is coming out of sleep at other times, while it is still in there. Anyone know what could be causing this? Where is the sensor that indicates the laptop has been opened? Can this be tuned or adjusted at all? I have "Allow Bluetooth Devices to Wake this Computer" turned off, so it's not my keyboard and mouse triggering it.