its easy to make things work f you just expect them too, in a dream all those electronics you just talked about are nonexistent, your mind works on a common sense level when creating dreams thus all it needs to know is that the room will seem brighter because your pushing the little thing that's jutting out of the wall upwards, if you wanted to you could make it so lifting your pinky turns on the light.... the mind doesn't need to create the electronics or know how it works, just what happens when it DOES work... electronics may as well be magic to the mind

don't get me wrong though, the mind can make things that aren't just based totally on common sense but that's usually how it works