In dreams, the presence of a watchman typically symbolizes safety and peace. It may also represent a secret friendship or hidden love in your life. The watchman acts as a protector, guarding you from danger. If you have this dream, it could indicate that you need some security in your life or that you are relying on someone for your protection.
From Imam Muhammad Ibn Seerin's Dictionary of Dreams According to Islamic Inner Traditions â entry "Watchman" (page 469) â resolved via the equivalent "Policeman" entry.
A policeman in a dream represents security and peace, prayers, a secret friendship, a hidden love, protection against Satan or his party, or perhaps he may represent one's guardian dog. A policeman in a dream also represents the angel of death, a fright, or distress. If a policeman brings his helpers with him in a dream, it means a scare, sorrows, sufferings, punishment, or a danger. He also may represent an evil person, a perfidious and a harmful beast or a lion. If someone in authority sees himself befriending a policeman in a dream, it means that he will make a new covenant, or introduce an amendment to the law, or draft a new constitution which he will sign. Ifone sees himselfputting a policeman in prison in a dream, it means that he will engage in a political fight. (Also see Crocodile; Lieutenant; Mercury')
Note: Islamic dream interpretation depends on the dreamer's circumstances and state. This is a general guide drawn directly from the source book.