This little light switch is for safety and convenience.
We all know that plug in night lights don't last very long so here is a simple and inexpensive solution for an electrician to make a home more comfortable.
Take an ordinary light switch like the one on the left below and add illumination.
During the day, you cannot see this light but when the house is dark, you can easily find the switch. It looks like the picture on the right...just a tiny little light.
Where would you use these illuminated lights?