DefinitionYawning involves opening the mouth involuntarily while taking a long, deep breath of air. This is usually done as a result of drowsiness or weariness. Excessive yawning is yawning that happens more often than would be expected, even if drowsiness or weariness is present.Alternative NamesExcessive yawningConsiderationsYawning is a normal response to fatigue and drowsiness, but excessive yawning can be caused by a vasovagal reaction. This reaction is caused by the action of a nerve, called the vagus nerve, on the blood vessels. It may indicate a heart problem.Normal yawning may happen when someone else yawns.Common CausesDrowsiness or wearinessDisorders associated with excessive daytime sleepinessVasovagal reaction Heart attackAortic dissectionHome CareFollow the treatment for the