Reason: Do you sometimes need to sneeze, but can’t quite do it? You may find the extra help you need by looking at a bright light. Photic Sneeze Reflex affects 18 to 35% of the population. When a sneeze is on the verge, look for the nearest, brightest light to help get that sneeze out. Unfortunately, this does not work for everyone. As someone who is a photic sneezer, the brighter the light, the more likely I am to sneeze.