From Standard of Care
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A reflex of simultaneous inhalation of air and stretching of the eardrums, followed by exhalation of breath.
The act of yawning and stretching simultaneously is known as pandiculation.
Associated with tiredness, stress, overwork, lack of stimulation, and boredom.
Can also be a non-verbal message with several possible meanings.
Activated chemicals include serotonin, dopamine, glutamic acid, and nitric oxide increase frequency of yawning increases.
Increased brain opioid neurotransmitters such as endorphins reduce the frequency of yawning.
Opioid withdrawal associated with increased frequency of yawning.
Selective serotonin reuptake inhibitor use associated with yawning.
Has a contagious quality.
Associated with empathy.