We have earlier seen how you can prevent Windows computer from going to sleep. In this article, we will tell you how you can prevent your computer from waking up from Sleep unexpectedly. It happens to most of us, we set our PC on Sleep mode and it sometimes suddenly wakes up for no apparent reason; even when we may not have touched it. And it’s annoying, leaving you wondering what may have made your PC wakes up automatically.
Prevent Computer from waking up from Sleep
This may occur due to a hardware device having been recently attached to your Windows 10/8/7 PC or because of any program which may have been scheduled. If you experience this annoyance frequently, you must check the following things:
A hardware device might be keeping your computer awake. USB flash drives and USB mice are common devices that can keep your computer awake. You must keep the drivers of all your attached devices updated to their latest versions.
Prevent device from waking your computer
1. Click on Start and go to Control Panel and open Device Manager.
2. In the list of hardware categories, find the device that you want to prevent from waking your computer, and then double-click the device name.
3. Click the Power Management tab and then clear the Allow this device to wake the computer checkbox.
4. Click OK.
A program or scheduled task might be waking your computer. By default, Power Options settings do not allow scheduled tasks to wake the computer from sleep or hibernate. However, some programs might awaken the computer if these settings have been changed.
Prevent programs from waking your computer
1. Click to open Power Options. 2. On the Select a power plan page, click Change plan settings for the plan that you want to change. 3. On the Change settings for the plan page, click Change advanced power settings.
4. On the Advanced settings tab, expand Sleep, expand Allow wake timers, choose Disable for both when your computer is running on battery and when it’s plugged in, and then click OK.
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Which program or process woke my computer
Mike Vanderkley adds in the comments: You can use powercfg /lastwake to find out what last woke your computer.