How to turn off mouse?

Hello Geeks,
Actually I download a lot of torrents and that means my desktop is on most of the times. So for power saving purposes I do switch off my monitor using hotkeys. Recently I was thinking that maybe I can turn off my mouse too which may save a little more power. (If anything can be saved, it must be saved.)So I was looking for any guy here who could help me turning my mouse off using any shortcut keys?
P.S: Please do not suggest unplugging my mouse from the usb for this method, although I do know that anything that can be saved must be saved, but I believe being a little lazy is always better.