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Yawning can indicate boredom or tiredness.
There are many theories about why people yawn, but no one knows for sure.

Yawn - Wikipedia

en.wikipedia.org/wiki/Yawn

A yawn is a reflex consisting of the simultaneous inhalation of air and the stretching of the .... A 2007 study found that young children with autism spectrum disorders do not increase their yawning...

Why We Yawn - WebMD

www.webmd.com/brain/news/20110923/why-we-yawn

Sep 23, 2011 ... People yawn more easily in cooler temperatures, supporting the idea that ... 23, 2011-- Why do we yawn? ... So do most vertebrate animals.

Facts About Yawning: Why We Do It, Why It's Contagious And More ...

www.huffingtonpost.com/2013/06/10/facts-yawning-why-we-yawn-contagious_n_3398301.html

Jun 10, 2013 ... We all do it, and we all know it has at least something to do with how tired ... The study found that people were more likely to yawn during the ...

Why Do I Yawn? - KidsHealth

kidshealth.org/en/kids/yawn.html

Everybody yawns — from unborn babies to the oldest great-grandparent. Animals do it, too. But why, exactly, do people and animals yawn? No one knows for ...

What makes us yawn? | HowStuffWorks

science.howstuffworks.com/life/inside-the-mind/human-brain/question572.htm

Why do people blush? Why are humans altruistic? ... Now that we know what a yawn is, let's look at what causes us to do it. On the next page, we'll discuss four ...

Excessive Yawning and What You Can Do About It - Healthline

www.healthline.com/health/yawning-excessive

Feb 29, 2016 ... Learn about possible causes and treatments for excessive yawning. ... Obesity is an epidemic in the U.S. This condition puts people at a higher ...

Why Do We Yawn and Why Is It Contagious? | Science | Smithsonian

www.smithsonianmag.com/science-nature/why-do-we-yawn-and-why-is-it-contagious-3749674/

Jun 28, 2013 ... Platek says that yawning is contagious in about 60 to 70 percent of people—that is, if people see photos or footage of or read about yawning, ...

The Surprising Science of Yawning - The New Yorker

www.newyorker.com/science/maria-konnikova/the-surprising-science-of-yawning

Apr 14, 2014 ... Yawning is one of the first things we learn to do. ... the eighties and nineties, Provine demonstrated that people report yawning more frequently ...

Why do we yawn? Nothing to do with boredom - we're just cooling ...

www.independent.co.uk/news/science/why-do-we-yawn-nothing-to-do-with-boredom-were-just-cooling-our-brains-say-scientists-9356468.html

May 12, 2014 ... A new study has suggested that the reason we yawn has nothing to do ... a video of people yawning were 41 per cent likely to yawn themselves ...