I bought a bluetooth dongle (http://www.newegg.com/Product/Product.aspx?Item=N82E168...) to connect my phone to my computer. While the bluetooth dongle is plugged into the computer (windows 7), the computer will not go to sleep. It won't even go to sleep if I manually put it to sleep. I didn't see any settings in device manager to fix the issue. Is there a way to fix this?