#57 Turn off unused lights

This is so simple. Leaving lights on wastes energy and money. When you leave the room, turn off the lights. If you are not in a room/closet/hallway then there is no need for the light. Why have it on? My hubby has been getting better at this, but there have been times I feel like I have to walk behind him to turn off every light he turned on as he leaves a room and will not be using that light anymore.