Dreams are like scenes from films – write them as if they are part of a film. Pay attention to the setting. Where are you? What does this setting mean to you? What theme does this setting suggest? What wouldn’t happen in this setting?
Dreams have a strange sense of place and time. Try to capture that sense of dislocation in your writing.
Also, all the characters are part of you, so look at the dream from each character’s point of view. What is important is not what happens but how the characters respond to what happens. So ask each character ‘How do you feel about what has happened?’