Ursula K. Le Guin

As crops dwindle and dragons reappear, mankind stands on the verge of total chaos. Lord Archmage Sparrowhawk, a powerful wizard, and Arren, a troubled young prince, search for the force behind this mysterious imbalance that threatens to destroy the land of Earthsea.

In a near future society a man claims that his dreams physically change reality. His therapist is confused at first but soon decides to use him for his own gain.

George Orr, a man whose dreams can change waking reality, tries to suppress this unpredictable gift with drugs. Dr. Haber, an assigned psychiatrist, discovers the gift to be real and hypnotically induces Mr. Orr to change reality for the benefit of mankind --- with bizarre and frightening results.