Well, yeah. If the world was all light all the time it'd be every bit as bad as if everything was darkness. Most people sleep in the dark, and everyone needs to do that. Besides... while too much darkness can be scary because you're not able to see anything and lost in a void, too much light is scary because it burns your eyes and keeps you from being comfortable.

The key is that all the elements are in balance with each other, and they work in this big harmonious circle thing. And problems occur when people try to break out of that circle--like what's going on here. Something's out of balance, and we just need to figure out what so we can fix it.