"Contagious yawning may have evolved to synchronize group behavior - yawns often cluster during particular times of day that coincide with transitions and activity. It also may have evolved to increase vigilance within a group.
The basic rationale is that if yawning is an indicator that one individual is experiencing diminished arousal, then seeing another person yawn might, in turn, increase the observer’s vigilance to compensate for the low vigilance of the yawner.
The spreading throughout the group of contagious yawns might then increase the vigilance of the entire group." (from Science.com).
Is that scientific enough for you? Maybe you're both just bored...
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