I am looking for the title of a sci-fi/ horror movie, I believe from the 80's... It's about a guy in his house where he dreams he commits a crime... But it becomes real... There is someone scary looking who talks to him... I think it's dream something, but not dreamscape...

Maybe Brainscan?

No, this was very low budget... from the 80's... the character that appeared was kind of like David Bowie in Labryinth... at the end, it was all a dream... dream something...