With dreams, there is often more to them than meets the eye. Discernment is critical in this matter. I do believe in praying with parents and their children to silence their nightmares; I have successfully done so with many. At the same time, it is important to understand that even nightmares can signify, if interpreted correctly, a forerunner understanding of what God wants to do in the life of this child. The enemy may try to shove his way in to distort that call by filling the child or even adults mind with dark and dire images of his design. Always remember the enemy is only threatened by what challenges him!
From the book "Dream Language"