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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

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What version of OS X are you running? –  daviesgeek Sep 4 '13 at 2:38
    
I think it is the newest one. I just bought it –  Daniel Sep 4 '13 at 14:04
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2 Answers

up vote 3 down vote accepted

The theory behind it is that it gets a lot more battery life when in deep sleep/hibernation than otherwise. Apple says after about an hour the computer should go into deep sleep.

See this question for further information and how to disable it. (The actual disabling instructions are in the question itself.)

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Also note that if you close the lid and you have a low battery charge that it may go low enough while closed that it stores the ram state to the HDD. This is so that when you reconnect to a power source and wake it up anything that you had opened will be restored as it was. This process takes time because you are basically reading 2-4 gigs worth of information back into the ram before it becomes stable enough to resume.

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