Fix Windows Sleep mode from waking up by itself

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Prevent your Network Card to wake your Windows Vista/7 up from its sleep

Check your network card properties through the device manager and disable the “Allow this devide to wake the computer” feature.

    Right click on your “My Computer” then select Properties.
    Click Device Manager on the left side of the Properties window.
    Check your Network card on the Network Adapters (Click on the + sign to expand).
    Right click on your network card and select properties.
    Go to the Power Management tab and untick the option there to prevent your network card from ever waking up your Windows.
    networkwakeupvistaautomatically Fix Windows Vista/7 Sleep mode from waking up by itself

Find out what wakes up your Windows 7/Vista from its sleep

To find out what event/device woke up your Windows from its sleep state, go to command prompt (type cmd on the Run/Search box and press ENTER), then type this:
powercfg –lastwake

wakeupeventviewer Fix Windows Vista/7 Sleep mode from waking up by itself

To get the most detailed info (and probably easiest) on the device that wakes your Windows up during the sleep, type:
powercfg –devicequery wake_armed

mousewakeupwindows Fix Windows Vista/7 Sleep mode from waking up by itself

There! You’ll find the culprit icon wink Fix Windows Vista/7 Sleep mode from waking up by itself I clicked my mouse to wake my Windows up intentionally so that’s why you see an HID compliant mouse on the screenshot above. Yours might be different.

Hope this helps!

If it still doesn’t work:

    Check out your Power Management Options on your Control Panel (Start, Control Panel, Power Settings, Change plan settings, Change advanced power settings).
    -> “Multimedia settings” option, “When sharing media.” ->”Allow the computer to sleep.
    -> Check other options one by one while you’re at it.

Fix Windows Media Center Random Wake Up

start > type in cmd in the search
right click "Run as Administrator"
Type powercfg -lastwake and press enter.

If you see a line like the following then we can fix it.

Supplied Reason: Windows will execute 'MicrosoftWindowsMedia Centermcupdate_scheduled' scheduled task that requested waking the computer.
How To fix

Open Task Scheduler and change the media center run schedule.

Start > All Programs > Accessories > System Tools > Task SchedulerTask Scheduler Library > Microsoft > Windows > Media Center

You will see the mcupdate_scheduled task in the center.

Right click on it and select "Properties".
Select the Conditions tab
Uncheck "wake the computer to run this task"

Your media center machine will no longer wake from sleep to get the guide / media updates when your machine is asleep. Instead it will automatically update the next time the PC is awake.

 Disable Wake Timers
Control Panel>Power Options>Change Plan Settings>Change Advanced Power Settings>Sleep> Now make sure you disable wake timers. What is probably happening is that you have a virus protector update or something along those lines scheduled and that’s what is waking the computer.

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