How to Fix Sleep Mode Not Working on a Dell Computer in Windows

If you've already tried the initial troubleshooting steps on our Windows Sleep or Hibernate: Doesn't Work or Cannot Wake Up page and your Dell computer still won't go to sleep, this article provides advanced troubleshooting steps to identify and resolve the issue in Windows 11.

Good to know: Many newer Dell computers use Modern Standby (also called S0 Low Power Idle) instead of the traditional sleep mode (S3). Modern Standby allows your computer to stay connected to Wi-Fi and receive updates, emails, and notifications even while it appears to be asleep, similar to how a smartphone works. This is by design and may explain why your computer seems to wake up on its own or shows signs of activity during sleep.

Before You Begin

Make sure you've completed the initial troubleshooting steps on the Windows Sleep or Hibernate: Doesn't Work or Cannot Wake Up page first. Those steps cover:

• Disconnecting external devices
• Disabling Fast Startup
• Updating drivers and BIOS using SupportAssist
• Checking for pending Windows updates
• Adjusting USB power settings
• Resetting power plans
• Refreshing the hibernation file (hiberfil.sys)
• Running the System File Checker (SFC)
• Running Dell Hardware Diagnostics

If you've completed all those steps and sleep mode still isn't working, continue with the advanced troubleshooting steps below.

Advanced Troubleshooting Steps

Work through each step in order. After each step, check whether your computer goes to sleep correctly before moving on.

Step 1: Check Your Sleep Settings in Windows 11

Your computer might not be going to sleep simply because sleep mode is turned off or the timer is set too high.

1. Select Start > Settings > System > Power & battery.
   • On a Dell desktop, this may appear as Power instead of Power & battery.
2. Select Screen and sleep to expand the section.
3. Set your preferred time for these options:
   • On battery power, put my device to sleep after — select a time (for example, 15 minutes).
   • When plugged in, put my device to sleep after — select a time (for example, 30 minutes).
4. Make sure neither option is set to Never (unless that's your preference).

Tip: If you want to put your computer to sleep immediately, select Start > Power > Sleep. If the Sleep option is missing from the Power menu, your power plan or BIOS settings may need attention, keep following the steps below.

Step 2: Run the Windows Power Troubleshooter

Windows 11 includes a built-in tool that automatically detects and fixes common power-related issues, including problems with sleep mode.

1. Select Start > Settings > System > Troubleshoot.
2. Select Other troubleshooters.
3. Find Power in the list and select Run.
4. Follow the on-screen instructions. Windows will detect issues and apply fixes automatically.
5. When the troubleshooter finishes, close the window and restart your computer.

Step 3: Find Out What Is Keeping Your Computer Awake

Windows 11 has built-in commands that tell you exactly what is preventing your computer from sleeping or what woke it up last. This step helps you pinpoint the root cause before trying other fixes.

Find active power requests

This command shows you any processes, drivers, or devices that are currently preventing sleep.

1. Select Start and type cmd in the search box.
2. Right-click Command Prompt and select Run as administrator.
3. Type the following command and press Enter: powercfg /requests
4. Review the results. Any items listed under DISPLAY, SYSTEM, AWAYMODE, or other categories are actively blocking sleep mode.

What to do with the results: If you see a specific app or process listed, try closing that app or checking its settings. If you see a driver or device listed, you may need to update or reconfigure it (see Steps 5 and 6).

Find out what woke your computer last

If your computer goes to sleep but keeps waking up, this command tells you the cause.

1. In the same administrator Command Prompt window, type the following command and press Enter: powercfg /lastwake
2. The result shows the device or event that woke your computer most recently.

Check for active wake timers

Wake timers are scheduled events that can wake your computer from sleep. This command lists all active wake timers.

1. In the same administrator Command Prompt window, type the following command and press Enter: powercfg /waketimers
2. Review the results to see if any scheduled tasks or apps are set to wake your computer.

Tip (for laptops): If your Dell laptop supports Modern Standby, you can generate a detailed sleep report by running powercfg /sleepstudy in an administrator Command Prompt. This creates an HTML report (saved in C:\Windows\System32) that shows a detailed history of your computer's sleep and wake activity over the last 72 hours.

Step 4: Adjust BIOS Settings

Certain BIOS settings on Dell computers can block or interfere with sleep mode. Two settings to check are Block Sleep (on desktops) and USB Wake Support.

1. Turn on (or restart) your computer.
2. At the Dell logo screen, press the F2 key several times until the BIOS Setup screen appears.
3. Navigate to the Power Management section.
4. Find Block Sleep (also called Deep Sleep Control). This setting is available on Dell desktop computers only.
   • If this option is enabled, disable it. Block Sleep prevents your computer from entering sleep mode.
5. Find USB Wake Support.
   • Enable this option if you want to wake your computer using a USB keyboard or mouse.
6. Select Apply to save your changes.
7. Select Save and Exit to restart your computer.

Step 5: Disable Wake Timers

Wake timers are scheduled events in Windows that can wake your computer from sleep to perform tasks like installing updates or running maintenance. If your computer keeps waking up on its own, disabling wake timers may help.

1. Select Start and type Edit power plan in the search box. Select Edit power plan.
2. Select Change advanced power settings.
3. In the Power Options window, expand Sleep.
4. Expand Allow wake timers.
5. Set both On battery and Plugged in to Disable.
6. Select Apply, then select OK.

Step 6: Stop Devices from Waking Your Computer

Hardware devices like your network adapter, mouse, or keyboard can send signals that prevent your computer from sleeping or wake it up unexpectedly. You can control which devices are allowed to wake your computer.

Check which devices can wake your computer

1. Select Start and type cmd in the search box.
2. Right-click Command Prompt and select Run as administrator.
3. Type the following command and press Enter: powercfg /devicequery wake_armed
4. This command lists all devices that are currently allowed to wake your computer.

Prevent a device from waking your computer

If you see a device in the list that you suspect is causing the issue (for example, a network adapter), you can disable its ability to wake the computer:

1. Select Start and type Device Manager in the search box. Select Device Manager.
2. Find the device you want to change (for example, expand Network adapters and select your network adapter).
3. Right-click the device and select Properties.
4. Select the Power Management tab.
5. Clear the checkbox next to Allow this device to wake the computer.
6. Select OK.

Tip: Network adapters are one of the most common devices that prevent sleep or cause unexpected wake-ups. If you are unsure where to start, try disabling wake for your network adapter first.

Step 7: Run a DISM Scan

If you already ran the System File Checker (SFC) scan from the sleep troubleshooting page and the issue persists, try running a DISM (Deployment Image Servicing and Management) scan. DISM repairs the underlying Windows system image that SFC relies on. If the system image itself is damaged, SFC alone may not be able to fix the problem.

1. Select Start and type cmd in the search box.
2. Right-click Command Prompt and select Run as administrator.
3. Type the following command and press Enter: DISM /Online /Cleanup-Image /RestoreHealth
4. Wait for the process to complete. This may take several minutes.
5. After the DISM scan finishes, run the SFC scan again to ensure all system files are repaired: sfc /scannow
6. Restart your computer after both scans are complete.

Step 8: Perform a Clean Boot

A clean boot starts Windows 11 with only essential Microsoft services and drivers. This helps you find out if a third-party program or service is preventing your computer from sleeping.

Start your computer in a clean boot state

1. Select Start, type msconfig in the search box, and press Enter.
2. In the System Configuration window, select the Services tab.
3. Check the box next to Hide all Microsoft services.
4. Select Disable all.
5. Select the Startup tab.
6. Select Open Task Manager.
7. In Task Manager, for each startup item that is listed as Enabled, select the item and then select Disable.
8. Close Task Manager.
9. In the System Configuration window, select Apply, then select OK.
10. Restart your computer.

After your computer restarts, check if sleep mode works.

• If sleep mode works — One of the disabled programs or services is causing the issue. Re-enable them one at a time (restarting after each) to find the culprit.
• If sleep mode still does not work — Move on to the next step.

Return to normal startup

When you are done troubleshooting, restore your normal startup configuration:

1. Select Start, type msconfig in the search box, and press Enter.
2. On the General tab, select Normal startup.
3. Select OK and restart your computer.

Step 9: Create a New User Profile

A corrupt user profile can cause various Windows issues, including problems with sleep mode. Creating a new user account helps you determine if the issue is tied to your profile.

1. Select Start > Settings > Accounts > Other users.
2. Select Add account.
3. Select I don't have this person's sign-in information.
4. Select Add a user without a Microsoft account.
5. Enter a username in the Who's going to use this PC? field.
6. Enter a password if you want one, or leave the password fields blank.
7. Select Next.

Sign out of your current account and sign in to the new account. Check if sleep mode works.

• If sleep mode works with the new account — The issue is with your original user profile. You can continue using the new account and transfer your files from the old profile.
• If sleep mode still does not work — The issue is not profile-related. Move on to the next step.

Step 10: Perform a System Restore

System Restore rolls your computer's system files and settings back to an earlier point in time without affecting your personal files. Use this if sleep mode was working previously and stopped after a recent change.

1. Select Start and type Create a restore point in the search box. Select Create a restore point.
2. In the System Properties window, select System Restore.
3. Select Next.
4. Choose a restore point from a date when sleep mode was working correctly.
5. Select Next, then select Finish.
6. Your computer will restart to complete the restore.

For detailed instructions, see: Reset or Reinstall Windows on Your Dell Computer

Step 11: Reset Windows 11 to Factory Settings (Last Resort)

If none of the steps above resolved the issue, resetting Windows 11 to factory settings can give your computer a fresh start. Use this as a last resort.

1. Select Start > Settings > System > Recovery.
2. Next to Reset this PC, select Reset PC.
3. Choose one of the following options:
   • Keep my files — Removes apps and settings but keeps your personal files.
   • Remove everything — Removes all personal files, apps, and settings.
4. Follow the on-screen instructions to complete the reset.

After the reset is complete, install the latest BIOS, chipset, and graphics drivers from the Dell Drivers & Downloads website.

For detailed instructions, see: Reset or Reinstall Windows on Your Dell Computer

If sleep mode still does not work after resetting Windows, contact Dell Technical Support for further assistance. The issue may be hardware-related and could require a diagnostic assessment.

Frequently Asked Questions (FAQ)

Why won't my Dell laptop go to sleep when I close the lid?

Your lid close action may not be set to sleep. Go to Control Panel > Hardware and Sound > Power Options > Choose what closing the lid does. Set the When I close the lid option to Sleep for both On battery and Plugged in.

Why does my Dell computer wake up from sleep on its own?

This usually happens because of a wake timer, a scheduled task, or a device (like a network adapter) sending a wake signal. Run powercfg /lastwake and powercfg /waketimers in an administrator Command Prompt to find the cause. See Steps 3, 5, and 6 in this article for instructions.

What is Modern Standby, and does my Dell computer use it?

Modern Standby (S0 Low Power Idle) is a newer type of sleep that keeps your computer connected to Wi-Fi while using very little power, similar to how a smartphone works. Many newer Dell computers use Modern Standby instead of traditional sleep (S3). To check, open an administrator Command Prompt and type powercfg /availablesleepstates. The output tells you which sleep states your computer supports.

Why is the Sleep option missing from my Start menu?

The Sleep option can disappear if your graphics driver is outdated, if the Block Sleep setting is enabled in the BIOS (on Dell desktops), or if a power plan setting has removed it. Update your graphics driver using SupportAssist, check your BIOS settings (Step 4), and make sure sleep is enabled in your power plan (Step 1).

Does sleep mode drain my laptop battery?

Sleep mode uses a small amount of power to keep your work saved in memory. On most Dell laptops, sleep mode uses very little battery over several hours. If your battery drains quickly during sleep, your computer may be using Modern Standby, which keeps background activities running. You can check this with a sleep study report, run powercfg /sleepstudy in an administrator Command Prompt.

How do I put my Dell computer to sleep using a keyboard shortcut?

There is no default keyboard shortcut for sleep in Windows 11, but you can use this quick method: press Alt + F4 on the desktop (with no apps in focus), and then select Sleep from the dropdown menu in the Shut Down Windows dialog box.

What is the difference between sleep, hibernate, and shut down?

Sleep saves your work to memory and uses a small amount of power to keep it there, your computer wakes up in seconds. Hibernate saves your work to the hard drive and turns off the computer completely, it takes longer to wake up but uses no power. Shut down closes all apps and turns off the computer completely, nothing is saved unless you save it yourself first.

Additional Resources

• Windows Sleep or Hibernate: Doesn't Work or Cannot Wake Up (Start here for initial troubleshooting)
• How to Download and Install Dell Drivers
• Dell BIOS Update Guide
• Reset or Reinstall Windows on Your Dell Computer