Sleep Mode is designed to conserve power and save battery life.
Usually, your setup will enter Sleep Mode automatically when it is idle for a quite a while.
What if your rig fails to enter Sleep Mode?
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Why Is Sleep Mode Not Working/Available?
Sleep Mode refers to a power-saving state that helps you to conserve more energy.
When your setup enters Sleep Mode, your data will be saved in the RAM.

It will turn off the display and stop most running processes.
This mode can save power and extend the battery life.
How to Fix Sleep Mode Not Working on Windows 10/11?

Heres how to do it:
Step 1.
Press Win + I to open Windows options and go to System.
If you have enabled this feature, disabling Fast Startup might be helpful.

To do so:
Step 1.
Click onSystem and Security>Power Options>Choose what the Power buttons do.
UntickTurn on fast startup (recommended)and save the changes.

Therefore, disabling this process might help you to fix Sleep Mode not working.
Heres how to do it:
Step 1.
LaunchCommand Promptas an administrator.
In the command window, typepowercfg /requestsand hitEnter.
Now, you’re free to see a list of applications that prevent you from entering Sleep Mode.
you might terminate them inTask Managerand enter Sleep Mode again to see if it still fails to work.
Fix 5: Run Windows Power Troubleshooter
Step 1.
PressWin+Ito openWindows Settingsand go toUpdate & Security.
In theTroubleshoottab, click onAdditional troubleshooters.
Scroll down to findPower, hit it, and then hitRun the troubleshooter.
In this condition, it is a good idea torestore your power plan tweaks to default.
Heres how to do it:
Step.
Navigate toHardware and Sound>Power Options.
Beside the power mode you are currently using, click onChange plan parameters.
Tap onRestore default prefs for this planand hitSave changes.
After trying these solutions, your system can enter Safe Mode when it is idle to save more energy.