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Here's a video that explains it, but basically you:
1, Click on the desktop search box.
2. Click Settings.
3. Type in Device Manager
4. In the Device Manager window, click on Mouse and Other Pointing Devices
5. Right-click on mouse device, then click on Properties
6. Click on the Power Management tab
7. Unclick the box that says "Allow this device to wake the computer"
8. Click OK