what does yawning indicate
Answers. Relevance. Rating Newest Oldest. Best Answer: Yawning is a normal response to fatigue and drowsiness, but excessive yawning can be caused by a vasovagal reaction. This reaction is caused by the action of a nerve, called the vagus nerve, on the blood vessels.It may indicate a heart problem.Source(s): http://www.nlm.nih.gov/medlineplus/ency/...nswers. Relevance. Rating Newest Oldest. Best Answer: Yawning is a normal response to fatigue and drowsiness, but excessive yawning can be caused by a vasovagal reaction. This reaction is caused by the action of a nerve, called the vagus nerve, on the blood vessels.