Windows Sleep Mode Not Working

The short answer

When Windows 10 sleep mode isn't working, the usual cause is something that is either asking Windows to stay awake or waking it back up. That something can be an app, a driver, a scheduled task or a connected device. Windows can show you which one it is. The built-in powercfg command lists active requests that keep the system awake. It also reports what caused the most recent wake. Run it before you change any settings.

Your next step depends on which of these three symptoms you have:

• The PC never goes to sleep on its own: something is holding a power request, or the sleep timer isn't set the way you think.
• The PC goes to sleep but wakes again almost at once: a device such as a mouse, keyboard or network adapter, or a wake timer, is waking it.
• Sleep works, but the webcam or microphone stops working after the PC wakes: this is a device resume problem, not a sleep problem, and it has its own checks (see the last section).

Why your microphone or webcam can keep Windows awake

Windows tracks power requests, which are signals from software or drivers saying "don't sleep yet." Two kinds of capture behave differently here:

• Microphone audio capture: when an audio stream is open, Windows can record a system power request against the audio driver. This applies to playback as well as recording. A meeting app, voice assistant, dictation tool or recording app that leaves the microphone open in the background can therefore stop automatic sleep.
• Webcam video capture: an app using the camera doesn't always create a power request through the camera driver itself. Video-call and streaming apps often request that the display or system stay on while they run, though. Whether a given app does this depends on how it was built. The powercfg output, explained below, tells you what is actually happening on your PC.

Keep three things separate here. The device being detected (it appears in Device Manager), an app having permission to use it (your privacy settings), and the device actively capturing are different states. Only active capture, an open audio stream or a running video session, produces a request that keeps the PC awake. Permission alone doesn't.

Checks to run, in order

1. Confirm your sleep settings

In Windows 10, open Settings, then System, then Power & sleep. Check the times under Sleep for battery and for plugged in, if your device has both. Next, open Additional power settings, then Change plan settings, then Change advanced power settings. Look at Sleep > Sleep after and Sleep > Allow wake timers. Some vendor tools and older apps install their own power plan, so confirm you are editing the plan that is actually active.

2. Find out what is preventing sleep

Open Command Prompt as an administrator. Then run:

powercfg /requests

The output lists requests under the headings DISPLAY, SYSTEM, AWAYMODE, EXECUTION, PERFBOOST and ACTIVELOCKSCREEN. Look at what is named under SYSTEM and DISPLAY. An entry that mentions an audio stream points to an app holding the microphone or speakers open. A named program or process points to that app. Close or reconfigure the app, then run the command again to confirm the request is gone. If you can't tell which app owns an audio stream, close communication, recording and streaming apps one at a time, including ones running in the system tray.

You might need an app to stay open but don't want it to block sleep. Windows offers an override command for that case, which tells Windows to ignore a specific caller's requests. Use it sparingly. It can stop a legitimate app, such as an active call or a backup, from keeping the PC awake when you actually need it to. To see the syntax, run:

powercfg /requestsoverride /?

3. If the PC wakes up on its own, find what woke it

Run these commands in an administrator Command Prompt:

powercfg /lastwake
powercfg /devicequery wake_armed
powercfg /waketimers

The first shows the source of the most recent wake. The second lists the devices allowed to wake the PC. The third lists scheduled wake timers. To stop a device from waking the PC, open Device Manager, open that device's Properties, go to the Power Management tab and clear "Allow this device to wake the computer." Mice, keyboards and network adapters are the usual candidates. To stop scheduled tasks or updates from waking the PC, set Allow wake timers to Disable in the advanced power settings from step 1. Some important update tasks may also be governed by separate maintenance settings, so a timer can sometimes still appear.

4. Run the Power troubleshooter (Windows 10)

In Windows 10, go to Settings, then Update & Security, then Troubleshoot, then Additional troubleshooters, and run Power. It checks common power plan misconfigurations. Microsoft has been retiring older troubleshooters in newer Windows releases, so this option may not appear on every build.

5. Check which sleep states your hardware supports

Run:

powercfg /a

This lists the sleep states that are available and explains why any others are not. Many newer laptops use Modern Standby (shown as Standby (S0 Low Power Idle)) instead of traditional sleep (S3). With Modern Standby, the PC stays partly active for network activity while asleep, which can look like sleep isn't working. If no sleep state is listed as available, the reason shown often points to a missing or generic display or chipset driver, or a firmware setting. In that case, update drivers from your PC or motherboard maker.

If the webcam or microphone fails after waking

In this case sleep works, but the camera shows a black image or the microphone goes silent when you return. The cause is how the device resumes, not what blocks sleep. Start with these checks:

• In Device Manager, check whether the webcam or microphone is still listed after wake. If it disappears and comes back only after a restart, the device or its USB connection isn't resuming properly.
• For USB webcams and USB microphones, open the Power Management tab on the device and on its USB Root Hub entries. Try clearing "Allow the computer to turn off this device to save power."
• In the advanced power settings, try setting USB settings > USB selective suspend setting to Disabled for the active plan.
• Reopen the app, then check that the right camera and microphone are still selected in its settings. Some apps fall back to another device if the original one briefly disconnected.
• Update the camera, audio and chipset drivers from your PC or device maker.

What this guide can't confirm

No device-specific evidence was available for this guide. That means it can't say which apps, webcam models or microphones most often block sleep, or which driver versions fix resume problems. The steps above use built-in Windows 10 tools. Most of the powercfg commands also exist in Windows 11, but menu paths differ there. If powercfg points to a specific driver or device, the maker's support documentation for that hardware is the most reliable next source.