Lights

There are only two of us in the household, but somehow, every single light seems to get turned on throughout the course of the evening. The office light stays on, all three living room lights are on, the dining room light is on, the kitchen light, the light in the hallway; they are all on for one reason or another. Why don't they get turned off behind us? I go around before going to bed and wonder that every night. For two people, there is a lot of wattage being spread across our house. I swear there is a light monster out there who turns on the lights for us and just lets them sit. That is the only explanation. I don't understand how two adults can leave so many lights burning.