Of course, this does not mean all prophets are dreamers. Likewise, neither does it mean that all dreamers are prophets. Anyone can have prophetic dreams, including unbelievers. Abimelech received divine instruction in a dream. Midianite soldiers in Jud.
Dreams springing up from self or satan can seem to have prophetic qualities.
If an idolater has a false god, then his so-called divine inspiration is false. The human soul can be inspired by strong desire or lust in dreams and break forth in poetry or song also. Hatred, bitterness, vengeance, fear and desire for approval are just a few of the human soul s strong drives that can come across like a holy edict in a dream. Ungodly psychology and psychiatry bears offspring like Freud, who worshiped sexuality and interpreted every dream through the filter of sex. Constantine, the Emperor of Rome, claimed to have a prophetic vision in AD 313.