So ... I was using my phone the over night, and set it down on my nightstand. This is my second phone (first one had a tilted screen with dust under it), but I never "checked it out" like I did the first one. So I set it face down, and look back ... and light was coming through the back! Like as if the back wasn't painted thick enough on the inside and light was coming through - like when you close you eyes on a sunny day and you can still "see" the orange of your eyelid skin. Is this what everyone is talking about when they say "light leak"? I made an appointment at my Apple Store on Thursday for a replacement.