Islamic Interpretation of Dreams (Ibn-i Sirin):
(Planet; Policeman) The planet Mercury in a dream represents people of authority, writers, commanders, secretary of state, minister, traveling from one country to another, distress, adversities, or fights.
If in wakefulness the Moon and Mercury are appearing simultaneously in the skies, then all dreams will be false and one may have to face lies, poverty, scary news, murders, or robberies.
The planet Mercury in a dream also represents a policeman.
(Also see Heavens)