I have super sensitive hearing , and can hear if the cable box has been left turned on at night, in the living room, from my bed. We now use surge protectors that we flip the switch and cut all power to the electronics in the house before going to bed. its amazing how far our power bill fell when we started UNplugging or switching the power off to things we are not currently using. A hum in a power free zone would make me batty.