Is It A Sin To Dream?

When darkness falls in the night, the only light shining through the window is the faint glow of the moon.
The world has gone to bed and so must I.

Close my eyes and fantasies beyond belief come to me in dreams so vivid full of life and haunting. My dreams come true, but never knowing when they are going too. Always seeing loved ones and friends turning from smiling faces to horrible monstrous, haunting faces.

What are the purpose of the forsaken dreams like almost it is a sin if I dream. Always Fighting, struggling, running away. And from what? The moon shines through my window, while my eyes remain closed, trapped inside a Haunting fantasy, almost like whispers in the dark. Horrible images, and physical pain to accompany the emotional wear and tear in my mind.

Am I just having nightmares, or is it a sin for me to dream?