HI Windy, Could I ask if you were taking less than 600 mg magnesium at any time, and was it effective to prevent afib episodes? I take 400 mg daily, but wonder if upping it to 600 might prevent more episodes. (And ditto re large meals... sometimes just certain acid food etc. will kick off an episode just after I eat. I actually sleep sitting up in a comfortable chair w/ feet up which helps w/ digestion.)