Diseases That Make You Yawn FrequentlyYawning 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