Strange movie

[yelever]

Ok saw the movie on tv once and has stuck with me all this time. All I can remember is this person (not sure if male or female) kept having these dreams about satan or something like that had returned to earth and the dreams were about a house and satan was coming out of the house but really the dreams were messages being sent back from the future and at the end of the film your saw it was this woman all along that was satan or something coming out of this house like in the dream. In the dreams there was a voice saying that it was a broadcast from the future or something and they could only broadcast on the same as dream frequencies or something like that. Anyone know this film?

[Danny]

Its not quite as you describe cos theres a church instead of a house but it sounds a lot like Prince of Darkness

Prince of Darkness (1987 - John Carpenter)

A priest invites Professor Howard Birack and his students to investigate a mysterious cylinder in the basement of an abandoned Los Angeles church. The cylinder contains a constantly swirling, green liquid. Throughout the night, it begins to possess the students one by one and uses them against the remaining survivors. After researching the text found next to the cylinder, it is discovered that the liquid is actually Satan himself.
The text also reveals that Satan is the son of an even more powerful force of evil, an Anti-God, who is trapped in another dimension. Satan possesses one of the students and attempts to bring his father through a dimensional portal, using a mirror.
At the climax of the film, Catherine Danforth , one of the students, stops this from happening by tackling the possessed student, and both of them fall through the portal--sacrificing herself in the fashion of Jesus Christ. Before she or the Anti-God can escape, the priest shatters the portal, trapping Satan, the Anti-God, and Danforth in the other realm. (Danforth is later seen "alive and well" in this other realm with her arms extended, crucifixion-style, as if resurrected.)
Following the climax, the students return home. An eerie and fragmented foreshadowing dream sequence occurs repeatedly during the film, apparently a transmission from the future year of 1999, each time showing a little more and also providing a final twist.
Marsh appears to awaken, and rolls over to find Satan, in the form of the possessed student, lying in bed with him. Marsh then awakens screaming, recovers, and approaches his bedroom mirror, hand outstretched. The film cuts to black just before his fingers touch the mirror.

[yelever]

Thanx danny. Rings a bell. The mirror bit sounds right. I`ll hunt down a copy, should be pretty cheap.