My afib episodes also appear to be triggered by neck position, particularly if my chin is jutting forward when I am awake, or if my head slides down from its position on a raised triangle-shaped foam pillow when sleeping.. Also feel it coming if inhale too much air when exercising or have pressure on chest when lifting light weights over head. Another trigger is accumulation of mucus in throat. Perhaps it is a response to narrowing of space for breathing or pressure on vagus nerve? Forcing myself to burp sometimes works to stop an episode from progressing. Anyone else experience these triggers or finding that burping helps?