Is it possible for someone to have psych dreams?

In a Word, NO. The devil and demons are popular figures in folklore and Horror fiction, and belief in demons has been a factor in mythology and common superstition since ancient times. In the modern world, particularly in Western Culture where education has reached most people, the idea of demonic influence has been limited to horror movies, fiction and fantasy gaming.

> In dreams, demons represent the dreamer's own fear and feelings of guilt. There is no actual entity influencing the sleeper's dreams. The "demon" is a product of the dreamer's own imagination.

Only if you're possesed by the devil