Your Windows 11 PC should slip into sleep when you step away, saving power and waking instantly when you come back. Instead it stays on all night, or it dozes off for a second and immediately jolts itself awake again.
Windows 11 sleep mode not working is one of the most common power problems I get asked about, and the cause is almost always a short list of culprits: sleep timers set to “Never,” wake timers left enabled, a network adapter pinging the PC awake, or a display driver gone bad after an update. The trick is to stop guessing and let Windows tell you exactly what woke the machine.
Every fix below uses free tools already built into Windows. I have run these same steps on my own desktop and a couple of family laptops, and the diagnostic command in the third section is the one that saves me the most time.
Quick Answer
Open Settings > System > Power & sleep and confirm sleep timers are set, not “Never.” Then run powercfg /lastwake in an administrator Command Prompt to see what woke your PC, disable wake timers under Power Options, and turn off Wake-on-LAN on your network adapter. These steps fix most sleep problems in under 10 minutes.
Is Sleep Actually Turned On in Your Power Settings?
This sounds too obvious to mention, but it is the cause more often than any other single issue, because app installers and Windows updates silently flip the timer to “Never.”
- Press Windows + I to open Settings.
- Go to System > Power & sleep.
- Under Sleep, set both “On battery” and “Plugged in” to a time you like. I use 15 minutes on battery and 30 plugged in.
- On a desktop you will only see “Plugged in,” which is normal.
While you are here, check the Screen timeout directly above. Your screen should turn off sooner than the PC sleeps; if the screen never blanks, the machine may never reach sleep. If the sleep dropdown is grayed out, a Group Policy setting or third-party app has locked it, so jump to the power-plan reset near the end.
Most “broken” sleep is simply a timer that was switched off, so always confirm this first.
Why Does Your PC Keep Waking From Wake Timers?
Wake timers are scheduled tasks, such as Windows Update or routine maintenance, that Windows lets pull the PC out of sleep. When my desktop kept waking at the same time every night, this was the cause.
- Search for Power Options in the Start menu and open it.
- Click Change plan settings next to your active plan, then Change advanced power settings.
- Find Sleep > Allow wake timers.
- Set both “On battery” and “Plugged in” to Disable.
- Click OK, then restart your PC.
If your PC wakes at predictable times overnight, disabling wake timers almost always stops it.
How Do You Find Exactly What Is Waking Your PC?
This is the step I reach for first, because it turns guesswork into a precise answer. Windows ships with a diagnostic that names the device or task responsible.
- Search for Command Prompt, right-click it, and choose Run as administrator.
- See what last woke your system:
powercfg /lastwake - List every active wake timer:
powercfg /waketimers - See what is blocking sleep right now:
powercfg /requests
On my own machine, /lastwake reported the Ethernet adapter receiving a broadcast packet, which pointed me straight to the Wake-on-LAN fix below. The /requests command often exposes a media player, a Teams or Zoom call, or a browser tab playing audio that is silently holding the PC awake.
Run these three commands before changing anything else, because they tell you which fix to apply.
Should You Turn Off Wake-on-LAN on Your Network Adapter?
Wake-on-LAN lets a network card power the PC on when it receives a signal, which is handy in offices but a nuisance at home when your router broadcasts all night. If /lastwake named a network adapter, yes, turn it off.
- Press Windows + X and click Device Manager.
- Expand Network adapters.
- Right-click your Wi-Fi or Ethernet adapter and choose Properties.
- Click the Power Management tab.
- Uncheck Allow this device to wake the computer, then click OK.
Repeat this for every adapter. If you have both Wi-Fi and Ethernet, disable it on both; missing one keeps the problem alive. No Power Management tab means that driver does not support it, so move on.
Turning off Wake-on-LAN on every adapter stops a chatty network from waking your PC.
Does Your Display Driver Need an Update or a Roll Back?
A broken or outdated display driver is a frequent cause of sleep failures, especially right after a Windows Update. Which way you go depends on when the trouble started.
- Press Windows + X and click Device Manager.
- Expand Display adapters.
- Right-click your GPU and choose Update driver > Search automatically for drivers.
If sleep broke after a recent update, roll back instead: right-click the GPU > Properties > Driver tab > Roll Back Driver. This fixed it on a laptop here faster than waiting for a new release. If the update itself failed to install cleanly, my guide on how to fix Windows Update not working on Windows 11 can help you get a healthy driver delivered. For NVIDIA and AMD cards, I find the driver from the manufacturer’s site more stable than the one Windows Update ships.
Update the driver if sleep was always flaky; roll it back if sleep broke right after an update.
Comparing the Built-In Tools at a Glance
When I am not sure which step fits a particular symptom, I use this quick map of the built-in tools and what each one is best at.
| Tool | Best for | Where to find it |
|---|---|---|
powercfg /lastwake |
Naming what woke the PC | Admin Command Prompt |
powercfg /requests |
Finding apps blocking sleep | Admin Command Prompt |
| Power troubleshooter | Auto-detecting common issues | Settings > Troubleshoot |
powercfg -restoredefaultschemes |
Resetting a corrupted plan | Admin Command Prompt |
Match the symptom to the tool above instead of running every step blindly.
What Does the Built-In Power Troubleshooter Catch?
Windows 11 has a Power troubleshooter that automatically detects and repairs common sleep settings. It does not catch everything, but it is fast and worth a try before the deeper fixes.
- Go to Settings > System > Troubleshoot > Other troubleshooters.
- Find Power and click Run.
- Apply any suggested fixes, then restart your PC.
The Power troubleshooter is a low-effort first pass that occasionally fixes the issue outright.
How Do You Reset a Corrupted Power Plan?
If nothing above worked, your power plan may be corrupted by an app, an update, or old manual tweaks. One command restores every built-in plan to factory defaults.
- Open Command Prompt as administrator.
- Run:
powercfg -restoredefaultschemes - Restart your PC.
This resets only power settings; your files, apps, and every other Windows setting stay untouched. Afterward, go back to Settings > System > Power & sleep and re-enter your sleep timer, since the reset clears it. Microsoft documents the full powercfg command-line options if you want to dig deeper.
Resetting the power plan clears hidden corruption without touching your personal files.
Common Mistakes to Avoid
- Sleep left on “Never.” The number one reason sleep “stops working.” An installer or another person set it and forgot. Fix: set a real timer in Power & sleep first.
- Wake timers still enabled. They drag your PC out of sleep at 3 a.m. every night. Fix: set Allow wake timers to Disable in Advanced Power Options.
- Disabling Wake-on-LAN on only one adapter. With both Wi-Fi and Ethernet, one still wakes the PC. Fix: turn it off on every adapter in Device Manager.
- Skipping
powercfg /requests. A media player or video call can block sleep indefinitely. Fix: run the command and close whatever it lists. - Updating a driver when a roll back is needed. If sleep broke right after an update, the new driver is the culprit. Fix: use Roll Back Driver instead of reinstalling the same version.
Frequently Asked Questions
Why does my Windows 11 PC wake up by itself at night?
Wake timers and Wake-on-LAN are the usual reasons. Run powercfg /lastwake in an administrator Command Prompt to see the exact trigger. On my desktop it named the Ethernet adapter, and disabling that adapter’s wake permission stopped the nightly wake-ups.
How do I stop Windows 11 from waking up to install updates?
Set Power Options > Advanced settings > Sleep > Allow wake timers to “Disable.” Updates still install, they just no longer wake the PC. After I disabled this, updates queued quietly and applied at my next manual restart.
Why will my Windows 11 PC not sleep even though I set a timer?
Something is holding an active power request. Run powercfg /requests as administrator and close whatever appears. In my case it was a browser tab streaming audio in the background that I had forgotten about.
My PC sleeps on battery but not when plugged in. Why?
Windows uses separate settings for each mode. Check the “Plugged in” sleep value in Power & sleep. On my laptop it was set to “Never” out of the box while battery mode was fine.
Will resetting the power plan delete my files?
No. powercfg -restoredefaultschemes only resets power settings like sleep timers and screen timeouts. When I ran it, every document, app, and other Windows setting stayed exactly as it was.
How do I confirm my PC actually entered sleep mode?
Open Event Viewer, go to Windows Logs > System, and look for the source “Power-Troubleshooter.” Each entry records when the PC slept and woke, and what triggered it. I use this log to verify a fix actually held overnight.
Conclusion
Windows 11 sleep problems almost always trace to a short list: a timer set to Never, wake timers left on, a network adapter pinging the PC awake, or a driver gone bad after an update. Start by confirming your timers, then run powercfg /lastwake to find the exact culprit and apply the matching fix.
If your laptop battery still drains faster than expected after sleep works, see my guide on why your laptop battery drains so fast on Windows 11. And if the PC still feels sluggish, my guide to speeding up a slow Windows 11 PC is the next stop.