Marlene- I said yes to the twitch. I seem to get them after I have removed myself from the stimulus. Better sit down cause I'm about to get weird. Watch Animal Planet, watch the lions chase the deer. Notice that when the lion fails to get the deer in the chase (attack), when the deer gets to safety he will shudder-his entire body will shudder. This is their built in ability to shed the over abundance of adrenaline. (Fight or Flight) Adrenaline helps us survive but could it be that we shed it poorly due to our hypervigilance? Could our twitch or shudder be our way of helping ourselves? Just a thought.