Yawning is not just about being tired, the leading theory involves cooling the brain.
What Yawning Probably Does
The best-supported hypothesis is thermoregulation: a deep yawn increases blood flow and draws cooler air, helping lower brain temperature and sharpen alertness.
Why It Is Contagious
Contagious yawning tracks with empathy and social bonding; it appears around age four and is stronger among people who know each other.
When Yawning Is a Symptom
Excessive yawning can occasionally signal sleep disorders, medication effects or, rarely, neurological conditions, worth mentioning if it is new and persistent.
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