Women are twice as likely to yawn as men - this is why - Mirror Online
Yawning - The surprising details behind a yawn | HuffPost Contributor
Why Do We Yawn + Are Yawns Really Contagious? - Casper Blog
Why do we yawn and is it really contagious? | NationalWorld
Why Yawning Is Contagious | Time
Yawning: Causes and reasons for contagious yawning
Simple Ways to Stop Yawning when Singing: 11 Steps (with Pictures)
Why Do We Yawn When We're Sleepy? Everything You Should Know
4 Things Your Yawns Are Trying To Tell You | Prevention
A simple slice of science - Why do we yawn? - Dr. How's Science Wows
Why Do We Yawn & Is It Contagious? | How To Sleep
Why is yawning contagious? Your tired tick, explained.
Yawns Are Cool · Frontiers for Young Minds
Is it Normal to Yawn Excessively? | WR Mattress
Why Do We Yawn + Are Yawns Really Contagious? - Casper Blog
Why do we yawn? | Library of Congress
What Is A Yawn? - YouTube
Why Do We Yawn? - The New York Times
Why do we yawn? | New Scientist
Yawn - Wikipedia
The Word That Makes 55% of People Yawn When They Read It | Reader's Digest
What is it about yawning?
Yawning and airway physiology: a scoping review and novel hypothesis | SpringerLink
Yawning doesn't catch on in babies › News in Science (ABC Science)
If sex is a yawn, you may actually be turned on
