You see: You yawn. Others see: <Player> yawns expansively.
YAWN <self> You see: Yawn at yourself? You should get out and do more. Others see: <Player> stifles a yawn.
YAWN <player> You see: You look at <Player> and yawn. Target sees: <Player> looks at you and yawns. Others see: <Player> looks over at <Target> and yawns.