I don't usually have the effect in sunlight and have recently not been sneezing when entering the kitchen which leads me to believe that my sneezing might have another cause. Some common triggers that I'll test include dark chocolate, red wine, nuts, and peanuts (technically a legume). Also, my sneezing (and coughing) tend to happen more at night when there is a bright light on, but that could just be a correlation. A doctor thinks my coughing is cause by what I think he called silent acid reflux. In other words, I have acid reflux, but instead of heart burn like symptoms I have a tickle in my throat that causes me to cough (and/or sneeze?).