Interesting side topic based on this, in certain parts of the Finland and northern Europe it actually stays night for several months of the year, as well as staying day for several of the other. So its a sunny day at 2Am or its pitch black at noon. Its fascinating, and sounds terrifying.

The more you know :P

But I agree, it's pretty terrifying to imagine a world that consists of only darkness. Gives me the Heebie Jeebies :P