In a dream, bragging represents a tyrant, an unjust person, or an aggressor.
If the person seen in a dream is already dead, it is a warning for his family. It also means failure to satisfy one’s religious obligations.
If the person noted in the dream is sick, then it means that he may be nearing his death.
If he is healthy, then bragging while yawning in a dream means affliction with an illness. (Also see Boast)
To dream that you are bragging means that you are feeling insecure about yourself. You are trying to overcompensate for your shortcomings.
To dream of someone else bragging suggests you have a judgemental streak. Try not to be overly harsh in your judgements of others.