"No one could tell you with any certainty exactly what happened. Very few actually were witness to the change, and those that were are certainly in no condition to tell anyone anything, God bless their souls. Of course, owing to mankind's insatiable need to define and explain, there are some theories. Most are reasonable - though what stands for "reason" in this day and age, I cannot say - and at least one of which I'm sure you will to be most fitting with your beliefs. Some are the usual, predictable fare, such as Divine Punishment and so on, while others push the imagination to it's limits and beyond (three words: Absolute Sunshine Club). Personally, I don't know what to believe. All I know for sure is that whatever it was that caused the light to forsake this wretched, broken world, I'm sure we deserved it."
~New York Times article, June the 28th, 2012
Welcome to Neverending Night (NeN). In this bleak world of the near future, and unknown force has caused all natural light to vanish from the world. The sun, the moon, the stars. All of them, gone. In it's place, a darkness so deep that it could be felt resting on your skin. Even made made light is scarcely able to pierce this darkness, as if the darkness itself swallowed it up. With this darkness also came something else. Hideous monstrocities that defy comprehension play and skulk on the outskirts of the feeble lights, leading those that glimpse them into screaming madness, and those that don't into their screaming maws. People and animals (what was left of them, anyway) began to mutate and develope strange abilities. Some for the better, some definitely for the worse.
You are one of the survivors that has managed to hold on to some reason to live in this horrific new land, where your entire world consists of what lies in the feeble beam of your flashlight and it's common place to commit murder over a battery with a little juice. It's a hard life, but a life none-the-less, and there are many ways to live it. The only question is: How will you live yours? Don't spend too long thinking about it, though. You're batteries are running low...

Promising, but cautious
That sounds interesting. Although I would be more interested in the "realistic" consequences of the absent of light, than other random effects (monsters) caused by this same mysterious force.
I personally really like the idea of monsters appearing in a society and what is can do (like in Doom, Mutant Chronicles, etc.), but only if it has some reasonably cause beside to have monsters to kill.
my RPGs