Please read the following explanation from Microsoft


Shut down, sleep, or hibernate your PC (Applies to: Windows 11, 10, Windows 8.1, Windows 7):


There are many ways to shut down your PC—you can turn the PC off completely, you can make it sleep, or you can hibernate the PC.


Turn your PC off completely


To shut down


For Windows 11/10:  Select Start and then select Power > Shut down.

For Windows 8.1 / Windows RT 8.1: Move your mouse to the lower left-hand corner of the screen and right-click the Start button or press Windows logo key + X on your keyboard. Tap or click Shut down or sign out and choose Shut down.

For Windows 7: Click the Start button and then click the Shut down button.


Sleep


This uses very little power, your PC starts up faster, and you’re instantly back to where you left off. You don’t have to worry that you'll lose your work because of your battery draining, because Windows automatically saves all your work and turns off the PC if the battery is too low. Use sleep when you’re going to be away from your PC for just a little while—like when you’re taking a coffee break.


For a lot of PCs (especially laptops and tablets), your PC goes to sleep when you close your lid or press the power button.


To make your PC sleep:


Open power options:

  1. For Windows 10, select Start , then select Settings  > System  > Power & sleep  > Additional power settings.
  2. For Windows 8.1 / Windows RT 8.1, swipe in from the edge of the screen, tap Search (or if you're using a mouse, point to the upper-right corner of the screen, move the mouse pointer down, and then click Search), enter Power options in the search box, and then tap or click Power options.
  3. For Windows 7, click the Start button , click Control Panel, click System and Security, and then click Power Options.

Do one of the following:

  1. If you’re using a desktop, tablet, or laptop, select Choose what the power buttons do. Next to When I press the power button, select Sleep, and then select Save changes.
  2. If you’re using only a laptop, select Choose what closing the lid does. Next to When I close the lid, select Sleep, and then select Save changes.

When you’re ready to make your PC sleep, just press the power button on your desktop, tablet, or laptop, or close your laptop’s lid.


On most PCs, you can resume working by pressing your PC's power button. However, not all PCs are the same. You might be able to wake it by pressing any key on the keyboard, clicking a mouse button, or opening the lid on a laptop. Check the documentation that came with your computer or go to the manufacturer's website.


Hibernate


This option was designed for laptops and might not be available for all PCs. (For example, PCs with InstantGo don't have the hibernate option.) Hibernate uses less power than sleep and when you start up the PC again, you’re back to where you left off (though not as fast as sleep).


Use hibernation when you know that you won't use your laptop or tablet for an extended period and won't have an opportunity to charge the battery during that time. First check to see if this option is available on your PC and if it is, turn it on.


To hibernate your PC:


Open power options:

  1. For Windows 10, select Start , then select Settings  > System  > Power & sleep  > Additional power settings.
  2. For Windows 8.1 / Windows RT 8.1, swipe in from the edge of the screen, tap Search (or if you're using a mouse, point to the upper-right corner of the screen, move the mouse pointer down, and then click Search), enter Power options in the search box, and then tap or click Power options.
  3. For Windows 7, click the Start button , click Control Panel, click System and Security, and then click Power Options.

Select Choose what the power button does, and then select Change settings that are currently unavailable. Under Shutdown settings, select the Hibernate checkbox (if it's available), and then select Save changes.


Now you’ll be able to hibernate your PC in a few different ways:

  1. For Windows 10, select Start , and then select Power > Hibernate. You can also press the Windows logo key + X on your keyboard, and then select Shut down or sign out > Hibernate.
  2. For Windows 8.1 / Windows RT 8.1, move your mouse to the lower left-hand corner of the screen and right-click the Start  button or press Windows logo key + X on your keyboard. Tap or click Shut down or sign out and choose Hibernate. Or, swipe in from the right edge of the screen and then tap Settings. (If you're using a mouse, point to the lower-right corner of the screen, move the mouse pointer up, and then click Settings.) Tap or click Power > Hibernate.
  3. For Windows 7, click the Start button , click the arrow next to the Shut down button, and then click Hibernate.


Windows 7 does not go to sleep:


Update the drivers to the latest version


To resolve your problem, start by making sure that you have the most current drivers for all your hardware devices (especially the driver for your video card). To obtain the latest drivers for Windows 7, you can use Windows Update, or you can check your hardware device manufacturer's Web site.


Check the Power Option settings


Next, check your Power Option settings. To do this, follow these steps:

  1. Click Start, type power sleep in the Start Search box, and then click Change when the computer sleeps.
  2. In the Put the computer to sleep box, select a new value such as 15 minutes. However, make sure that you do not select Never. Then, click Change advanced power settings.
  3. Expand Sleep, expand Allow waker timers, and then select Disable. Note This setting prevents programs from waking your computer. If you want a scheduled task to wake your computer, you have to change this setting back to Enable.
  4. Expand Multimedia settings, expand When sharing media, and then select Allow the computer to sleep. Note This setting lets your computer go to sleep even if you share media libraries with other computers on your home network.

Disable the device(s) from waking the computer


For the last step, try to disable any devices that might wake your computer. To disable these devices, follow these steps:

  1. Start an elevated command prompt. To do this, click Start, type cmd in the Start Search box, right-click cmd, and then click Run as administrator.
  2. To see the list of all devices that can wake the computer, run the following command:
      Powercfg -devicequery wake_armed
  3. To disable a specific device from waking the computer, run the following command, or use Device Manager:
    Powercfg -devicedisablewake "devicename"
    Note Make sure that you replace the devicename placeholder with the name of the device that you want to disable.
  4. If this issue still occurs after you disable one device, disable the devices in this list one by one until you determine which device is causing the issue. If you want to re-enable a device to wake the computer, run the following command:

    Powercfg -deviceenablewake "devicename" command.


Disable devices by using Device Manager


You can also use Device Manager to disable or enable a device to wake the computer. To do this, click Start, type device manager in the Start Search box, and then click Device Manager. Locate and then double-click the device that you want to disable or to enable. On the Power Management tab, click to clear or click to select the Allow this device to wake the computer check box as needed.