yawning

Yawning is linked to arousal, brain temperature, social contagion, and state switching. This guide explains what scientists know and what remains uncertain.

Contagious yawning catches 50-60% of adults. Empathy, mirror neurons, social bonding — what the research really says about why we copy yawns.

What yawning actually is, why it's contagious, and why brain cooling — not oxygen — is the leading scientific explanation.

Yawning is one of the most universal human behaviours, and one of the most poorly understood. Multiple theories compete; none is fully accepted. Here's what science actually knows.