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

If You Yawn Does That Mean You're Tired | Sleep.org

sleep.org/articles/yawning-when-tired/

Find out if you're yawning, does that mean you're tired.

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 ... That doesn't mean we're totally in the dark when it comes to catching flies. Here are a few of ... to why we yawn. FIrst off, we don't only do it when we're tired. ... about yawning can trigger one (did we get you yet?). Turns out, it's ...

Why Do You Yawn When You're Not Sleepy? | Psychology Today

www.psychologytoday.com/blog/brain-sense/201111/why-do-you-yawn-when-youre-not-sleepy

Nov 16, 2011 ... Despite what you may have heard, yawning has nothing to do with ... this happens because yawning evolved as a means of communication.

Why do we yawn when we are tired? And why does it seem to be ...

www.scientificamerican.com/article/why-do-we-yawn-when-we-ar/

Aug 12, 2002 ... You are correct in thinking that yawns are catching. ... If so, then its contagious nature is most likely a means of communication within groups of ...

You don't yawn because you're tired - CNN.com

www.cnn.com/2014/05/08/health/time-yawn-brain-hot/

May 9, 2014 ... A new study suggests that you may not really be yawning because it's contagious , or you're bored or tired. ... us in Facebook Messenger. Find out what's happening in the world as it unfolds. Why do yawns seem contagious?

Why do you yawn when you are tired? - Quora

www.quora.com/Why-do-you-yawn-when-you-are-tired

Sep 18, 2015 ... When you are tired, your body's energy levels are pretty low. Which means that your body cells need more fuel or in other words, more oxygen.

The Surprising Science of Yawning - The New Yorker

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

Apr 14, 2014 ...You don't decide to yawn,” Robert Provine, a neuroscientist and the author of “ Curious ... Indeed, fatigue and boredom do reliably elicit yawns.

Does my frequent yawning mean my brain isn't getting enough ...

www.askdoctork.com/does-my-frequent-yawning-mean-my-brain-isnt-getting-enough-oxygen-201305134813

May 13, 2013 ... DEAR READER: Most of us yawn more often in the early morning and late evening. Does it mean you're tired? Bored? Not getting enough ...

8 reasons for excessive yawning you probably didn't know about ...

www.thehealthsite.com/diseases-conditions/reasons-for-excessive-yawning-p915/

Sep 6, 2015 ... We don't always yawn only when we are tired, it may be due to bigger health issues. ... of why we do this is yet unknown, yawning when you are tired is a ... yawning without fatigue or lack of sleep could indicate heart trouble.