On Harnser I have used domestic plate switches for light switches. To make them easier to find in the dark I have drilled a small hole in the plate above the switch and installed a small LED from behind into the hole. The LED with a suitable resister wired in series is then wired across the switch terminals.
The result of this that when the light is switched off the LED is in series with the light and is illuminated. When the light is switched on the LED is shorted out and goes off.
I often find that in the dark of night there is sufficient light from the LEDs for me to find my way around the boat and for this reason I would not suggest fitting one in the bedroom.