My 2007 Intel iMac is waking from sleep on its own during the early morning hours. Not sure why. Is there a way to find out by looking at some sort of log files or something else?

I'm wondering if someone else is having control of my iMac as it randomly wakes up from sleep while I am sleeping sometime during the night. I've woken up with the light from the monitor brightening my room. Need to find out what is causing it to wake up and stay on. Any suggestions?

I've had this same issue lately. Here's one thing to check: System Preferences > Energy Saver > Wake for Network Access should be unchecked.
Mine is unchecked, so the only other thing I can think of is that it might be Time Machine backing up. My iMac is backing up to an external hard drive, and also sharing that drive over the network so two other Macs can back up as well.
Should be an easy theory to test. Turn off AirPort, unplug Ethernet, and let the iMac sit. See if it still happens.

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    Message was edited by: craigie b

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