If your mouse is set to wake the computer from Sleep Mode, even the slightest bump of your desk can wake it back up. Here we’ll show you how to avoid this annoyance by disabling it from waking up your machine.
I have seen this happen a lot at home and in the office. A Vista or Windows 7 computer is supposed to be in Sleep Mode and when you come back to your machine after a few hours you see it up and running. If you have the mouse set to wake it up from Sleep Mode, sometimes the slightest movement can wake it up. To disable the annoyance type mouse into the search box in the Start Menu and hit Enter.
Under the Hardware tab click on the Properties button.
Under the Power Management tab uncheck the box next to Allow this device to wake the computer then click Ok and close out of the Mouse Properties window.
This comes in very handy if you have a cat who messes around with your stuff at night. You can do the same thing for your keyboard if you want.
Now when you put your Windows 7 or Vista machine in Sleep Mode, the mouse can’t be used to wake it up.