YAWN (a regular verb and a noun)
A yawn is a reflex of simultaneous inhalation of air and stretching of
the eardrums, followed by exhalation of breath. Pandiculation is the act
of yawning and stretching simultaneously.
Yawning in adults
occurs most often immediately before and after sleep, during tedious
activities and as a result of its contagiousness, and is commonly
associated with tiredness, stress, overwork, lack of stimulation and
boredom, though studies show it may be linked to the cooling of the
brain. In humans, yawning is often triggered by others yawning (e.g.,
seeing a person yawning, talking to someone on the phone who is yawning)
and is a typical example of positive feedback. This "infectious"
yawning has also been observed in chimpanzees, dogs, and can occur
across species. Approximately 20 physiological reasons for yawning have
been proposed by scholars, but there is little agreement about its main
functions.
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