Do you sleep with the light(s) on or off?

My wife is crazy about sleeping with no light in the room. We have an alarm clock that gives you the option to keep the display light off, all the chargers are covered up with clothes to keep the light away. Perfectly dark. Light doesn't bother me at all, as a kid I used to go to sleep with the lights on and because of how late I usually wake up there's usually plenty of light around me when I get up.

Also have the fan going on low no matter what season it is.