If you had angry thoughts and feelings during your waking hours, these may continue into your sleep. Since your anger was unresolved, your dream of being angry only stoked your state and you woke up feeling the same anger.

Art Mater – Art matters in Dreams
To my Holy Mother of Artists. Content include Dreams, Mental Health & etc.
If you had angry thoughts and feelings during your waking hours, these may continue into your sleep. Since your anger was unresolved, your dream of being angry only stoked your state and you woke up feeling the same anger.