I just noticed a small little dot that looks like a photoelectric cell or something at the botton of my navigation/idrive screen.

Is that what it is, or am I seeing things?

I would think maybe that if it was, it would dim the screen and turn it into "night" mode or something. My Acura TL had day/night modes, and the nave screen looked like "night" when I turned on the headlights. Should mine in the e60 do something similar?