It's funny. Growing up my mom habitually hassled my sister and I about turning off the lights when we left a room. Doing that is a habit I still have to this day. SO did not grow up being told to do that so I perpetually turn off the lights in any room he has left. With the new skylight I actually spent the first weekend turning ON the light in the stairway. Every time I walked into it it was so bright that I habitually assumed SO had left the light on so I'd hit the switch, the light would come on, and I'd think "Oh, the light wasn't on" and have to turn it off again.