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While many take yawning to be a sign of tiredness, sleepiness, stress or simply a lack of interest, it could even be an indicator of many other physiological phenomena. This write-up elucidates on what causes one to yawn. Advertisement.hile many take yawning to be a sign of tiredness, sleepiness, stress or simply a lack of interest, it could even be an indicator of many other physiological phenomena. This write-up elucidates on what causes one to yawn. Advertisement.
The evolution theory: Some think that yawning began with our ancestors, who used yawning to show their teeth and intimidate others. An offshoot of this theory is the idea that yawning developed from early man as a signal for us to change activities [source: University of Washington]. The boredom theory: Although we do tend to yawn when bored or tired, this theory doesn't explain why Olympic athletes yawn right before they compete in their event or why dogs tend to yawn just before they attack.