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

sleep.org/articles/yawning-when-tired

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

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 ...

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

Aug 12, 2002 ... You are correct in thinking that yawns are catching. ... More information is needed to fully understand the origin and meaning of the yawn. It may ...

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

Nov 16, 2011 ... Do brains, like computers, operate best when they're cool? Some evidence suggests that yawning may help regulate brain temperature and ...

blog.verlo.com/blog/does-yawning-mean-youre-tired

Apr 9, 2017 ... Tired, bored, or following someone's lead and yawning? What's the reason for yawning? Learn about the interesting reasons for you yawn.

www.ask.com/youtube?q=Does+Yawning+Mean+You+Are+Tired%3F&v=qbYA-N1_qUU
Apr 10, 2017 ... For centuries, people have come up with different explanations for yawning. Some of these reasons for yawning are quite reasonable, like you ...

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

May 9, 2014 ... A new study suggests that you may not really be yawning because it's contagious , or you're bored or tired. ... The video player encountered an error. Why do yawns seem contagious? 01:32 ...

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

Apr 14, 2014 ... “You just do it. You're playing out a biological program.” We yawn unconsciously and we yawn spontaneously. We can't yawn on ...

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.