Dehydration, really fatty and dense foods, bright screens in dark rooms, and lack of sleep are my triggers. I find aspirin and sipping on water for a while will

Dehydration, really fatty and dense foods, bright screens in dark rooms, and lack of sleep are my triggers. I find aspirin and sipping on water for a while will make the pain subside somewhat, and then a nap will clear it away. I'm not sure if this is really the case physically, but I treat it as if there's a buildup of metabolites in my brain, and that is pretty effective at removing the problem.