I am quite confused, I close the lid and then my mac book pro goes sleep and sometimes it seems to be in deep sleep and sometime it is not. I mean, sometimes when you open the lid, it will recover soon with a log-in window showing up quickly, sometimes it will show a white screen and a recovering progress bar at the bottom and then a few minutes later the log-in window.
What's the theory behind this? How can I prevent it from going to deep sleep mode? Thanks