Long before Inception there was Dreamscape, in which psychics use technology to enter people's dreams. The budget was modest and the acting is only serviceable, but the basic story is reasonably well-developed, and it was a new idea at the time.

Fun Facts:

According to author Roger Zelazny, the film developed from an initial outline that he wrote in 1981, based in part upon his novella "He Who Shapes" and 1966 novel The Dream Master. He was not involved in the project after 20th Century Fox bought his outline. Because he did not write the film treatment or the script, his name does not appear in the credits; assertions that he removed his name from the credits are unfounded.[4] The music score is by French composer Maurice Jarre.

• https://en.wikipedia.org/wiki/Dreamscape_(1984_film)

• the link from above: https://www.youtube.com/watch?v=mw8Ty_4boDY (480p)

• look for an invidious interface: https://redirect.invidious.io/watch?v=mw8Ty_4boDY

• alternate link: https://www.youtube.com/watch?v=P3vcSLNH_94 (360p)