PC Won't Sleep or Keeps Waking Itself Up? Find the Culprit with powercfg

Your PC either refuses to go to sleep, or it wakes up by itself moments after you send it to sleep.

Why: something is either holding a power request (an app or driver telling Windows to stay awake) or there’s a wake timer / armed device (a scheduled task, update, mouse, or network card) pulling it back out of sleep. powercfg names the exact culprit so you don’t have to guess.

Fix 1: Find what’s keeping the PC awake (won’t sleep)

In admin Command Prompt or PowerShell:

powercfg /requests

This enumerates active Power Requests — the apps and drivers preventing the display from turning off or the system from sleeping. A media player, a browser playing audio, or a backup tool is a common offender. Close that program (or quit the offending tab) and the system can sleep again.

Fix 2: Find what woke it (wakes by itself)

After an unexpected wake, check the last wake source:

powercfg /lastwake

Then list the timers scheduled to wake the machine:

powercfg /waketimers

This often points at a scheduled maintenance task. As Microsoft documents, Windows configures a daily Regular Maintenance task and, with Allow wake timers enabled, will program the clock to wake the PC to run it — for example a powercfg /waketimers line reading “Windows will execute ‘NT TASK\Microsoft\Windows\TaskScheduler\Regular Maintenance’ scheduled task that requested waking the computer.”

Fix 3: See which devices are allowed to wake the PC

List the hardware currently armed to wake the system:

powercfg /devicequery wake_armed

For any device you don’t want waking the PC (often the mouse or network adapter): open Device Manager, double-click the device, go to the Power Management tab, and untick Allow this device to wake the computer.

Fix 4: Turn off wake timers and maintenance wake-ups

If a scheduled task keeps waking the machine:

• Settings > System > Power & battery > Power mode area, then Additional power settings > Change plan settings > Change advanced power settings > Sleep > Allow wake timers and set it to Disable (or Important Wake Timers Only).
• To stop maintenance specifically, open Control Panel > Security and Maintenance > Maintenance and turn off the option that lets scheduled maintenance wake the computer.

FAQ

powercfg /requests shows “[DRIVER] Legacy Kernel Caller” — what is that? Usually an audio driver holding a request. Update the audio/chipset driver; closing media apps first often clears it.

The PC wakes about 2 seconds after I sleep it. That’s typically a USB mouse or keyboard. Use Fix 3 to disarm it, or unplug it briefly to confirm.

Sources: Microsoft Learn — Desktop wakes up unexpectedly from sleep or hibernation, Microsoft Learn — Powercfg command-line options