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Possible Duplicate:
Troubleshooting a Windows 7 PC that wouldn’t sleep

Recently, my computer started to refuse to stay in sleep mode. Every time it goes into sleep, it is wakened right away. I just reinstalled Windows 8 without activating media sharing and the behavior remains.

What I discovered is that if I clear the CMOS, the first sleep period will last but any subsequent one, even if I restart the computer, will behave as explained. So, every time I clear the CMOS, I get one sleep period and that's it.

Anybody have an idea for what to try next?

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When this has happened to me, it was a bad device driver. Check Action Center, or Advanced Tools in Performance Information and Tools. I've had both of them help me out when this happened by telling me what device was responsible.

If neither of them have any information, look in Device Manager for any outright errors and the Event Log for messages indicating what device woke the computer up.

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