How much notice do you have to give? <a href=" http://goldentabs.com/categories/Other/Buy-Cheap-Coumadin.html ">Order Warfarin Online</a> In general, the brain is very plastic in recovering and finding solutions to injury or crisis. For example, for the brain to recover from sleep loss, you just have to sleep more later on. The heart stopping is the severest crisis the brain will ever see. I have a hypothesis—there is no proof of this—that perhaps this [final burst of increased brain activity] is a built-in defense against this kind of crisis. I hypothesize the evolutionary reason for that increased activity in the brain is simply the brain trying to rescue itself. It's the last-ditch effort.