i usually just close the lid of my new retina MacBook Pro and leave it overnight. when i woke up this morning i noticed again - like a couple times before - that the bottom is REALLY hot as if the machine was still running all night. could it have something to do with powernap? or battery issues? edit: i just noticed that when i tried to turn the machine off that it gave me an "mail doesnt respond" error and wouldnt shut down. could this be the culprit?