Somewhere between 18 and 35 percent of the population has this reflex, which is a genetic quirk—a dominant genetic trait, to be exact. It's been in our DNA a long, long time: the first reported case of this was recorded by philosopher Aristotle. In The Book of Problems, he wrote, "Why doth the heat of the sun provoke sneezing, and not the heat of the fire?" way back in 350 B.C.
Achoo! Most people sneeze after a tickling sensation finds its way up their nose, but for some, sunlight is another trigger. This is called the photic sneeze reflex, otherwise known as solar sneezing or ACHOO syndrome (which stands for Autosomal Dominant Compulsive Helio-Ophthalmic Outburst. Cute, right?).
Why People Are Talking About It
Why It Happens
Editors' Picks: Our Favorite Videos On Sneezing
Why Do Some People Sneeze In Sunlight?
We don't know, but we sure can guess!
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Guess What Else Can Make You Sneeze
Turns out that some people also sneeze when you turn OUT the light, if you catch our drift.