I plug my iron into a power strip that has a red light when the strip is powered on with it's on/off switch. My Ott light and small fan is also plugged into the power strip. So, I know everything is off when I leave the room as the light is out. My iron is supposed to have an auto off, but it still feels too warm if not used in over a hour.
I have another Ott lamp which clamps onto my sewing table and has a flexible arm. It has a big module that plugs in. I was shocked the other night when I unplugged it and it was "very" hot. The lamp had been on for about 5-6 hours. I have learned to unplug anything not in use that uses those power modules to help save on electric. I recently got a new Cable box, and the new one does not have a plug module that gets hot to the touch.