I heard this on the radio this morning, it makes since. If you have a newer vehicle chances are there is a panic button on your keychain. You may want to think about keeping your keys next to the bed. Say you hear someone breaking in to your house, if you have this type of keychain and hit the panic button your car will start honking the horn. Probably enough noise to discourge the bg from continuing. If you have two of the keychains you may think about a permenent place for the spare by your bed. I can't think of a scenerio that this practice would not be helpful. Good idea?