While taking a class, I was asked if there was something wrong with the light on my sewing machine. I was turning off my sewing machine after each time I sewed in the class. At home whenever I leave the machine (even to iron) the machine is turned off. I guess every time the instructor glanced at my machine, it was off and light wasn't on. I explained that I was used to sewing with animals and small children under foot and didn't want anyone "sewing" on their own. So I started this safety habit AND didn't even know I was doing it. The instructor laughed and said this was fine as long as my machine was not computerized (which it isn't). She said the many on/off's may cause the machine to loose its settings.
Thanks for the reminders to be safe. My bad habit is that I sew over pins. I am working to change this one!