Diseases That Make You Yawn Frequently Yawning is an involuntary process that involves opening your mouth and taking deep breaths, filling your lungs with air. It is a very natural response to tiredness, which is generally triggered by drowsiness or fatigue . Some yawns are short and others last several seconds before a huge exhale. Watery eyes, stretch, or audible sighs can accompany this act. Researchers aren't quite sure why it happens, but common triggers include fatigue and boredom. It is believed that contagious yawning may have associated with social communication. Additionally, a 2013 study published in the Journal of Applied and Basic Medical Research suggests that yawning can help cool the brain's temperature. Excessive yawning is one that occurs more than once a minute and maybe a symptom of an underlying medical problem. Certain conditions can cause a vasovagal reaction, which results in a more extensive yawn. During a vasovagal reaction, activity in the vagus ...
