At our age that's a catch all innit?
Lots of stuff is proper little energy vampires , our washing machine draws some power even if it's seemingly switched off. Only way is to switch it off at the wall socket.
Refrigeration is a big consumer, old machines get inefficient and have longer run times. The valves in the compressor get worn.
Teenagers are energy vampires unless they go green .
The plug in monitors mean you can check each item individually.