A dream can warn us of potential danger, and decoding our dreams often helps to solve problems. Frequently things that trouble us crystallize in a dream.
Some dreams even predict the future.
Studying and interpreting dreams isn't new, as they have fascinated man since the dawn of time. Dreams have been carved on cave walls, set in stone, and every Roman Legion had a soothsayer to try and make sense of 'nocturnal visions'. In ancient times, priests consulted oracles and shrines for guidance to try and make sense of dreams. Our ancestors believed that dreams were messages from the gods, and in days gone by, interpreters of dreams were visited much as doctors are today. Times may have changed, but the fascination of dreams remains.