Sneezing doesn't stop your heart, but it can change its rhythm. During a sneeze, the diaphragm contracts and affects the vagus nerve, which can slow down the heart rate. Sneeze syncope is fainting ...

Medically reviewed by Valerie Cacho, MD In general, people do not sneeze when they sleep. However, someone may wake up from sleeping and then sneeze. Jump to Key Takeaways. Why Sneezing Is Rare in ...