A. Run

powercfg -devicequery wake_armed

to see all devices that are allowed to wake your machine. An example run of the command from my system is shown here.

C:\>powercfg -devicequery wake_armed
Microsoft USB Dual Receiver Wireless Mouse (IntelliPoint)
Realtek PCIe GBE Family Controller
Microsoft USB Dual Receiver Wireless Keyboard (IntelliType Pro)