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

I recently started facing problem with the Sleep feature of Windows 7. Whenever I press the sleep button, it goes into sleep mode but soon after a second, it automatically turns on and shows the Login window.

Could someone point me what's happening in there?

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marked as duplicate by CharlieRB, Canadian Luke, Simon Sheehan, Karan, Oliver Salzburg Dec 15 '12 at 0:34

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

Run powercfg -devicequery wake_armed to see which devices can wake up the PC again. Now disable the ability to wake up.

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Seems like one of your USB devices is randomly turning it on. Follow the first answer from the link provided by goblinbox. That explains how to fix the issue.

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