Now this is a silly question. I have never been afraid of the dark; I'm always afraid of whats in the dark. I have a very active Imagination, which means the shadows that the darkness creates (and yes it does create shadows unless you are in the pitch black where absolutely no light could reach) turn into creatures. I used to have tigers roaming my bedroom at night, in fact a couple of months a go i thought i had a turbaned man in my bathroom O__o yeah, that was weird. Now you say this is a fear of what could be, urm mine seemingly seems to be a fear of what couldn't be there. A not so irrational fear is when you are immersed in total darkness, of which i have been before whe i was caving. Your fear then is not irational, because you are scared of where you might tread and if there is nothing beneath you.
Anyway, in answer to your question. No i was never afraid of the dark because that was silly. I has a nightlight i used so i could read in to all hours of the night, but then that would go off. Then i would sit there stroking the tigers that roamed my room, and talking to the shadows. DOes that mean i'm not a normal child?
... Yes it does, weirdo ;)