Why does looking at a street lamp give a hand me sneeze?

Sometimes I feel approaching I have to sneeze, but I lately can't. Many years ago a friend recommended that in that suitcase to look up at a light.and it works every time! Why? Sounds to me close to you've got a condition call photic sneeze reflex.
My guess is.. What it does is what you naturally do when you sneeze.. you heave your head and consequently you sneeze.
it may also be that when most people look at a street lamp it releases the pressure build up.. or it does for may anyway.