When I put my computer into sleep mode, it will wake up while I'm away from it. There's nothing near the computer that could move the mouse or accidentally press a button and I have no idea what might be causing it.
I tried checking what woke it, apparently LASTWAKE only tells me that it has been in sleep mode, not what woke it up.
I also couldn't find anything in my Power Options regarding Sleep that seems off. Poking around in the Event Viewer I notice the following:
The Power-Troubleshooter event at the top notes the following:
The system has returned from a low power state.
Sleep Time: 2012-10-27T11:31:53.408927000Z
Wake Time: 2012-10-27T12:25:51.887029300Z
Wake Source: Unknown
So does anyone have an idea to find out what might be causing it and how I can prevent my computer from randomly waking up?
Answer
I've had this problem before when I had network shares that were hosted on the sleeping machine, but accessed by other machines on the network. There are some settings for network cards that determine if it can wake the machine from sleep, and under what conditions:
This TechNet article explains the power management settings for network devices on Win7. There's not a Win8 version of this page yet, but I assume they are somewhat similar.
Beyond this, many other devices with similar checkboxes to allow for waking - I'd probably advise turning as many of these off as possible, and seeing if your problem persists. If it does, you might consider a binary search style approach to figure out which one is the offending sleep-disturber.
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