system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does the sun make me sneeze?
gpt
It’s called a photic sneeze reflex, or Autosomal dominant Compelling Helio-Ophthalmic Outburst - ACHOO syndrome for short. It is estimated that 17-35% of the population have it.

But no one knows why it happens. The best guess at the moment is that it’s because the nerve cells that carry information from the eye and those that carry information from the nose run so close together. As the nerves from the eye are stimulated by bright light, usually to constrict the pupil, electrical signals ‘spillover’ and activate the nerves coming from the nose. This causes the brain to confuse a bright light with a nose irritation, and… ACHOO! In fact, the area of the brain responsible for processing visual information is overstimulated in photic sneezers compared with non-sneezers, which may underlie the spillover effect.