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A yawn is a reflex of deep inhalation and exhalation
associated with being tired, with a need to sleep,
or from lack of stimulation. Pandiculation is the
term for the act of stretching and yawning. Yawning
is a powerful non-verbal message with several possible
meanings, depending on the circumstances. It is
also claimed to help increase the state of alertness
of a person. It could possibly be from lack of oxygen.
The exact causes of yawning are still unknown... |
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