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Right after it wakes up do what I said above and it will tell you what woke up your computer.
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What Version do you have on order, Windows 8 Upgrade or Windows 8 System Builder OEM
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You have only one choice-Windows 8 System Builder OEM DVD.
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The key is to use powercfg /lastwake in command prompt right after the computer wakes up.
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I think this link should be helpful:
Computer wakes up from sleep at night - Microsoft Community
Regards, Andy