You can fix this from the Device Manager. That’s the Ethernet port that connects my computer to the internet, and it means some sort of network activity is waking the computer up regularly. One of my insomniac computers told me that it was waking up thanks to an Intel(R) I211 Gigabit Network Connection. (You can enter the BIOS setup by pressing a key when your computer first boots, usually something like Delete or F2-the boot screen will usually tell you.)

If your computer doesn't stay asleep after this, you might also try entering the BIOS and disable USB waking from there, if you see an option for it. Select Properties and the Power Management tab, then uncheck the Allow This Device to Wake the Computer option and click OK. Once you find the problematic hardware, open the Start menu and search for 'Device Manager.' Find the device in the resulting list-say, your keyboard-and right-click on it. Keep doing this until you find the offending device. If it doesn’t, you can leave one device plugged in the next time you put it to sleep. If you have trouble figuring out which device is the problem, remove all your USB devices the next time you put your computer to sleep, and see if it wakes up on its own. I’d bet dollars to donuts it's your mouse or keyboard-maybe your cat thinks it's a fun toy when you aren’t looking-but it could be anything. If Windows tells you a USB device is waking your computer, you’ll have to find the offending device. In the sidebar, head to Windows Logs > System, then click the Filter Current Log button on the right side of the window. Click the Start menu, search for 'Event Viewer,' and launch the tool. I’ve also had luck searching Windows’ Event Viewer for information. If that command didn’t give you useful information, try this one: powercfg -waketimers In other cases, it may list a specific hardware device, and you can skip down to the relevant section in this article, or do some extra Googling on what settings to change on that device.

In that case, your search is over, and you can adjust that program’s settings or uninstall it to stop the problem. For example, the last time my workstation woke up, it was due to my cloud backup program running its scheduled backup for the evening.

If you’re lucky, it’ll give you a pretty clear answer. Type the following command and press Enter: powercfg -lastwake Windows knows what woke up your computer most recently, so the next time it wakes up unexpectedly, open the Start menu and search for “cmd,” then right-click the Command Prompt and choose Run As Administrator.

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Cmd prompt pops up randomly