Some researchers believe that yawning may have evolved as an adaptive social cue, allowing groups to signal and coordinate times of activity and rest.

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Some researchers have proposed that yawning has evolved as an adaptive social cue that signals times of activity and rest, allowing groups to synchronize their behavior and coordinate rest breaks. This theory suggests that yawning has a social function in addition to its physiological purpose of increasing oxygen intake and regulating brain temperature.

Some Researchers Believe That Yawning May Have Evolved as an Adaptive