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I left my Mid 2010 15" MBP with 10.8.1 open to keep downloading files, and when I came back to my computer and pressed a key, I saw the gray booting up screen and realized by computer rebooted instead of woke up. I'm not sure why the computer went to sleep in the first place, because it usually doesn't, and I can't find any information in Console about what happened. Even though my applications already restarted, any processes that I had in progress were halted, so it's definitely a problem. Any thoughts on what might have caused this, or what I could do to diagnose this?

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