Sadly, I am a triggerless and causational failure.  I have been called worse things, but not often.

 

Nope

Indoor or outdoor lighting issues
Not really, except for my antiquated theory about the whole seasonal rotaional aspects of the planet and the seasons.  Sigh, what a macaroon I am.  Still, it's a badge that I wear with honor. 

 

Nope

Night driving
Not really, but night driving wasn't any more fun than daytime driving on occasion.

 

That brings us back to the old, reliable earth rotation/tilt theory.

Sinus and/or upper respiratory conditions
Nope

 

Colds, flu
Nope

 

Insufficient sleep
Nope

 

Emotional conditions or situations
Nope, but I have sufficient emotional difficulties to fill an encyclopedia

 

Nope

Chemical agents, i.e. cleaning products
Nope

 

Stress
Nope

 

Nope, but I sure would love some, any issues that would give me something with which to work.

 

Final thoughts are that I would have loved, desired and given anything on which to blame my symptoms.  Denied that, it is clear to me that I am totally bereft of the comfort of triggers.  What a shame.