This isn't my picture but it's an example of what always happens in night shots.
Now if you don't notice the bright side on the right then look at this...
I bought an 808 thinking it had an amazing camera and it simply doesn't for night shots. Every picture I take has the same bright side and every website I check, they have the same thing happening on theirs. I don't know if it is external light shining from the metal into the lens, though that doesn't make sense as it's always on the same side. I thought it was the LED light that always comes up before you take a pic, however if you switch the infinite, that doesn't come on and it still happens.
I can only think it's either a software issue Nokia will never fix because they've ditched the phone now or it's a fault in the design of the lens.