Hi! Good day , Jerry here, an independent advisor. Here to help you.
If the sleep mode is missing you can try this following steps below.
- Check if Sleep is disabled in Control Panel
First up, we need to check if the Sleep option is enabled in Control Panel. We are going to check the configuration of Power Options and see if there is some misconfiguration. Follow the given steps to do the same.
-Open Control Panel by searching it out of the Start Menu.
-Go to System and Security > Power Options.
-Select Choose what the power button does.
-If Sleep is unticked, click on Change the settings that are currently unavailable.
-Tick Sleep and click on Save changes.
Now, check if you can the Sleep in the Power Option.
- Restore Power Plans
Another method to resolve any misconfiguration is by restoring the Power Plan settings. All you have to do is run a command and your issue will be resolved. So, open Command Prompt as an administrator and run the following command.
powercfg -restoredefaultschemes
- Edit Group Policy
Open Group Policy Editor by searching it out of the Start Menu. Now, navigate to the following location.
Computer Configuration > Administrative Templates > Windows Components > File Explorer
Look for Show sleep in the power options menu, double-click on it to open, select Enable, and click Apply > Ok.
Restart your system and check if the issue persists. If you are still not able to find the Sleep option in the Power menu, open Group Policy Editor and go to the following location:
Computer Configuration > Administrative Template > System > Power Management > Sleep Settings.
Look for Allow standby states (S1-S3) when sleeping (plugged-in) and Enable it.
- Update Windows and Drivers
If the Sleep option is greyed out, chances are either the Operating System or drivers are not up-to-date. You should first check for updates and install them if available. Then, update all your drivers. The following are some of the methods to update drivers on Windows computers.
Check for Windows Optional and Driver updates.
Download the latest version of all the drivers from their respective manufacturer’s websites.
- Run Power Troubleshooter
-Open Settings.
-Go to System > Troubleshoot > Other troubleshooters.
-Click Run associated with Power.
If you have any additional questions please don't hesitate to ask.