When opening my MacBook pro, after it has sat overnight while plugged in, it always restarts as if my battery has died. Does anyone know why it would do this?

Are you closing the lid? If not, are any sleep events scheduled in the Energy Saver preference pane?

In the Energy Saver preference pane, select the Power Adapter tab and uncheck the box marked Enable Power Nap while plugged into a power adapter. For the consequences of this step, see below.

Mountain Lion: About Power Nap

The next time you have the problem, note the exact times when it starts and ends: hour, minute, second.

If you have more than one user account, these instructions must be carried out as an administrator.

Launch the Console application in any of the following ways:

☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)

☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.

☞ Open LaunchPad. Click Utilities, then Console in the icon grid.

Make sure the title of the Console window is All Messages. If it isn't, select All Messages from the SYSTEM LOG QUERIES menu on the left.

Scroll back in the log to the time you noted above. Select any messages timestamped during that interval. Copy them (command-C) to the Clipboard. Paste (command-V) into a reply to this message.

When posting a log extract, be selective. In most cases, a few dozen lines are more than enough.

Please do not indiscriminately dump thousands of lines from the log into this discussion.

Important: Some private information, such as your name, may appear in the log. Anonymize before posting.

.. reset the smc.. maybe you do need to buy a new battery. I see its a mid 2012 Mac though. Coul dbe a power block thing too. If you press option and the battery icon in the menu bar does it say "service battery"?

Triple-click anywhere in the line below to select it:

pmset -g custom

Copy the selected text to the Clipboard (command-C).

Launch the Terminal application in any of the following ways:

☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)

☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.

☞ Open LaunchPad. Click Utilities, then Terminal in the icon grid.

Paste (command-V) into the Terminal window.

Post any lines of output that appear below what you entered — the text, please, not a screenshot.

Intel-based Macs: Resetting the System Management Controller (SMC)

This is a problem with all 2012 MacBook Pros that have applied the update DL1609 via Software Update. This update is called MacBook Air and MacBook Pro Update 2.0. The only fix that exists for this is to reinstall OSX and just not install this update when it shows in the available updates list in the AppStore. Just hide it until this issue is fixed by Apple.

If your OSX 10.8.2 version is anything after version (12C60) then you will have this problem. The problem is as follows. With the system asleep with clamshell closed, plugging and unplugging the power cable causes the system to wake up and go back to sleep. Additionally, leaving the system plugged into power for over 4 hours will cause the system to go into hibernation, but only when plugged in. If it's not connected to AC power while sleeping for that long, it will not enter hibernation.

Please call Apple and complain about this problem. I have been working with them for over a month and a half trying to get them to fix this and it's a major hand-holding process because they didn't initially understand the issue. Add to that the fact that they insisted that this problem doesn't exist and it just made it that much harder to get them to see the issue.

You need to call them AppleCare and let them know you're having this problem. Along with that, email the rep you're working with links to every Apple Support Forum thread you can find on this. Trust me, there are several with this same exact problem.

I have the exact same issue. Come on APPLE fix this problem!!!

I'm still waiting for Apple to fix this problem. I constantly have to wait five minutes every day for my Mid-2012 MacBook Pro to wake from hibernation after charging. It should never be going into hibernation in the first place.

Well this is frustrating. This just started happening to me this week.

Macbook Pro 13" Mid 2012 running OSX 10.9.4

I note that the most recent update I installed was the 10.9.4 update itself, on July 10th.

The smoking gun in the release notes is the line:

http://support.apple.com/kb/HT6281

Improves the reliability of waking from sleep

Well, I can't say I agree with that.

I've gone from "working perfectly" to finding my macbook now hibernates overnight while charging.

Oddly, I only recall it having this behaviour in the last few days - and not since the update was installed nearly a month ago.

(Yes, I've checked scheduled events, and the console utilities log. It appears to go into hibernate approximately 3 hours after I've finished using it).

I can see the system "does something" (polling?) every hour and then decides it's time to hibernate.