what does it mean to yawn
Yawning is a mostly involuntary process and is usually triggered by sleepiness or fatigue. It is a very natural response to being tired. Yawning is the involuntary process of opening the mouth and inhaling deeply, filling the lungs with air. Some yawns are short, and some last for several seconds before an open-mouthed exhale. Watery eyes, tears, runny rose, stretching, or audible sighs may accompany yawning.