You may be on to something zigzag,
I recall an article (why can't I find these later?) about CSD
(cortical spreading depression) that mentioned its results mimicked
the chemical effect on brain tissue of a whole night's sleep in only a
few minutes.
IMO: If you think of neurons as chemical batteries (I suppose they
literally are), the CSD wave is a sort of deep cycle discharge that
flushes out neurotransmitter chemicals that build up in the
interstitial spaces. I've long thought my CSD seizures were a
mechanism for "resetting" visual brain tissue that has become
overloaded and unstable. If you watch an animation of one traveling
through the visual cortex, it just looks like that's what's happening.
http://www.migraine-aura.org/content/index_en.html
It's a brain cramp!
On that note. My new prescription eyeglasses seem to have ameliorated
my migraine aura attacks. I think my last one was May 22. I would
never have thought something so simple would fix this weird problem
but it did (so far). Perhaps my brain was working too hard making
images from my bad eyesight. I can't think of anything different that
would account for the respite from these attacks.