Question

what is the reason for difficulty in YAWNING

Answer 1

YOUR ANSWER.......
Although excessive yawning is usually attributed to being sleepy or bored, it may be a symptom of an underlying medical problem. Certainconditions can cause a vasovagal reaction, which results in excessive yawning. During a vasovagal reaction, there is increased activity in the vagus nerve.
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Answer 2

Yawning is associated with the stretching of many muscles on the face, respiratory tract, at times also the limbs and trunk.

This leads to the transmission of a signal to the brain, the part that is involved in experiencing good sensations.

However, when a person is stressed or anxious, he/she faces a difficulty in yawning.

It is because during a stressed situation, an individual finds difficulty in relaxing completely and hence acquiring the required muscular stretches for yawning to take place.