On Reflection: My guess is that blood flow to certain parts of my brain ain't what it should be and helping me relax tense muscles, fixes that. Especially neck. The change in my visual field is an interesting one. My vision tends to get hazy or fuzzy, cloudy snow…and when it's bad(which last was a long-long time ago) I get striking lines across my vision, I start to internally vibrate, sweat? feel light headed, etc. I used to have to sleep them off. Fresh cold air and sleep the only thing that helped. Since learning(myself) to massage my neck and manipulate it and any tense areas I've managed to control the initial foggy head indicator and avert anything worse than a little cloudy snow.

So it affects my vision, my cognitive ability(feeling light headed), something triggers my hypothalamus into releasing a stimulant(internal vibrations/sweat/pulse?). On that I'm wondering if its a reduction in blood flow to the cortex and a reflex action. The cortex handling vision comprehension, my cognitive ability and consciousness. My readings on synesthesia indicate reduced blood flow can potentially explain sensory(my vision) changes. Right now my cognition in spelling is horrendous, I'm relying heavily on Firefox to fix my mistakes.

I need to relax for a bit again. Hmm. What's making me tense?

So… laying down potentially provides more blood pressure for parts of my brain as well as relaxes my muscles that may be impinging on arteries and blood flow. Dense cold air equals more oxygen and may explain why I always sought out cool fresh air.
I just remembered how my hearing can in turn be effected, I become noise sensitive, sometimes hear high pitch sounds.

It's blood flow to the cortex. What else could it be? I mean other than insanity. Tee hee! Oh shit, I joked! My prefrontal cortex must be struggling.

Did you hear the one about the railway worker and the hot iron through the eye and out the top of his head? After all the damage to his prefrontal cortex he became crass and impulsive and a non-stop joker.