here's what I'm seeing on the question of what causes palpitations. Too little sleep, too much sleep; too little food, too much food; too little liquid, too much liquid; too much stress, too relaxed; too little magnesium, too much magnesium; too little exercise, too little exercise; not having a pacemaker, having a pacemaker; drinking hot liquids, drinking cold liquids; standing up, lying down; doing too much, sitting quietly and not doing anything! Does anyone else see a pattern here??