CAUSE
One question. One truth.
“Why do we yawn?”
Yawning primarily regulates brain temperature by increasing blood flow and drawing in cooler air. This improves neural efficiency, supported by 2026 studies showing increased carotid arterial blood flow and cerebrospinal fluid movement during yawns.
Medium confidenceStructural
CURRENT STATE
Yawning currently cools the brain and enhances alertness, especially during tiredness, boredom, or stress. This is evidenced by increased heart rate and blood flow through neck arteries, facilitating brain thermoregulation and possibly waste clearance.
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