I know AF is a law unto itself, and there have been many discussions on here about what might trigger an attack. I just wondered what others have experienced when the heart returns spontaneously to NSR. I had a 3 hour AF episode this morning, decided to just stay quiet and sit it out. After 3 hours my daughter rang to see how I was doing and within about 5 mins it reverted. Other times it has reverted often in the ambulance, or on arrival at the hospital. Once, when the nurse slapped a freezing cold cuff on my arm for bp, or another time the nurse gave me a cup of tea. What circumstances have other Afibbers found might revert them to NSR?