Yawning and airway physiology: a scoping review and novel hypothesis | SpringerLink
Yawning: An unsolved mystery
Yawn - Wikipedia
Is yawning a tool for wakefulness or for sleep?
Why do we yawn? | Library of Congress
Why Do We Yawn When We're Sleepy? Everything You Should Know
Simple Ways to Stop Yawning when Singing: 11 Steps (with Pictures)
What is it about yawning?
What Is Yawning? | SiOWfa15: Science in Our World: Certainty and Controversy
Yawns Are Cool · Frontiers for Young Minds
The Word That Makes 55% of People Yawn When They Read It | Reader's Digest
Why do we yawn? Scientists are still searching for the answer
Yawning Caused by Anxiety
What Is A Yawn? - YouTube
If sex is a yawn, you may actually be turned on
The Word That Makes 55% of People Yawn When They Read It | Reader's Digest
Open wide: why yawning reveals much about your level of empathy | Life and style | The Guardian
Why Do We Yawn & Is It Contagious? | How To Sleep
4 Things Your Yawns Are Trying To Tell You | Prevention
What happens in the brain to make us 'catch' yawns - BBC News
Yawning - The surprising details behind a yawn | HuffPost Contributor
Is it Normal to Yawn Excessively? | WR Mattress
Why we yawn and What it means
Why do we yawn and is it really contagious? | NationalWorld
Why Is Yawning Contagious? | Mental Floss
Why Do We Yawn? - The New York Times
