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Fun fact: the tissue in the nose is just like that found in the penis and clitoris. When I get that feeling that I need to sneeze, a light stimulation of the tip of my nose with a fingernail is all it takes to guarantee satisfaction.

Looking into bright light and getting triggered for sneezing is called the photic sneeze reflex.

I’m one of the 18% (?) of the population with it, and it is hereditary.

I actually kind of like it, as if I need to sneeze all I need to do is look at a bright light.

Isn't it caused by the eyes watering a bit, and the drip internally stimulating the sneeze ?

Is it relative brightness or absolute?

specifically sky, a bright screen won't trigger it

It definitively works with bright lights, but intensity seems important (maybe also spectrum.) I find only a light that would hurt to stare at works

Maybe try a HDR screen (?)

I use a friend as a test to know if chocolate is >85% cocoa as it makes him sneeze (the occasion doesn’t present itself very often I’ll admit). I think I have the sun one, but it’s pretty occasional