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People tends to yawn anytime of the day or night everyday. Just this reason alone will let you know that yawning dosen't always relate to sleepiness. Being tired, restless, and depressed can all be reasons why people yawn.
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www.associatedcontent.com/article/407987/why_do_people_...
www.associatedcontent.com/article/407987/why_do_people_yawn.html
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This is a very interesting question, but I'm afraid that the answer as to why we yawn is still quite a mystery to science. ... Scientists have simply failed to provide satisfying reasons for these behaviors to exist - though there are of course many theories - all unproven. ... Thus, smiling is to let people know that you're happy,
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www.madsci.org/posts/archives/aug99/934846431.Gb.r.html
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People yawn for many reasons including stress, boredom, emotion and over-work. Have you noticed that yawning seems to be contagious? If one person yawns, this appears to cause another person to yawn. Researchers have found that 40-60% of people who see a picture of someone yawning will yawn themselves.
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www.chevroncars.com/learn/wondrous-world/yawn-contagiou...
www.chevroncars.com/learn/wondrous-world/yawn-contagious
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In man, evidence is not as easily obtained for obvious reasons, and the lymphatic route of drainage, ... Although people often yawn at night before going to bed, studies have shown people yawn most within the first hour of waking up. Yawning is often a part of stretching and is considered to be a stretch of the face.
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www.members.shaw.ca/hilaryking/Oldbrain1.htm
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Online information sources and tools for patients seeking to better manage their health. ... The Medical College of Wisconsin Office of Clinical Informatics has been involved with a number of initiatives designed to bring timely, relevant health information to consumers. ... More about MyChart...
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Yawn - Wikipedia, the free encyclopedia
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A yawn (from the Middle English yanen , an alteration of yonen or yenen , which in turn comes from the Old English geonian ), is a reflex of simultaneous inhalation of air and stretching of ...
en.wikipedia.org/wiki/Yawn
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It does not necessarily indicate fatigue, although people do tend to yawn when they're sleepy. A study was done in which heart rate, skin effects, and muscle tension were measured in 30 young adults before, during, and after yawns.
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healthlink.mcw.edu/article/901227084.html
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We know that yawning appeared early in vertebrate history and that and most other animals with backbones, including fish, turtles, birds, and crocodiles, engage it. But we don’t know why it appeared. [...] People begin to yawn early in their lives. ... Why Not Believe? Reasons for Atheism...
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atheism.about.com/b/2006/02/14/why-do-people-yawn.htm
atheism.about.com/b/2006/02/14/why-do-people-yawn.htm
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(ACTH hormones) and oxytocin facilitates yawning. Opiod peptoids inhibit yawning, which would explain why people experiencing withdrawal from opiates yawn excessively. ... Also, the fact that people yawn in response to others yawning shows that we do not always yawn from a physiological need.
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academic.evergreen.edu/curricular/hhd2001/Yawn.htm
academic.evergreen.edu/curricular/hhd2001/Yawn.htm
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