Actually, no one has figured this out yet, but I am 100% positive of it. Strokes are caused by cyanide poisoning not from the brain, nor the arm but the toxins that are on the skin and what gets absorbed into the body. Sleeping too long in certain positions can cause cyanide paralysis, and mind you, those that use cyanide also know to use radiation to agitate and get the toxins moving. I am 1000% sure of this.