The 1980 PBS presentation of The Lathe of Heaven is based on the book by Ursula Le Guin. It stars Bruce Davison (who has a Star Trek connection), Kevin Conway (who plays Kahless in ST:TNG) and Margaret Avery. The music is by Michael Small, who did the music for the late lamented Nero Wolfe tv series. Oh, how we wish that series had lasted longer! And we loved the music.
This is well worth watching whether you've read the book or not. It's thought-provoking.
This film is online at googlevideo:
EW gives it a "B". Le Guin, who is credited as a creative consultant says it's "still a goodie".