Sci fi / Fantasy movie

I am looking for sci fi movie that was in the late 80's or early 90's. I've seen it on tv a few times in the 90's. Its about two teenage guys who are friends discuss what type woman they want while his friend is sleeping the other guy stays up daydreaming about his dream woman. There is this dream sequence that happens an he is on the beach having a fun time with the woman. The next morning he wakes up realizing he wasn't dreaming because his jacket was missing and the woman on the beach was wearing it his friend doesn't believe him but then the woman appears in his bedroom wearing the jacket. I can't remember how she is able to appear the them but each time she enters their world or they enter hers there is music like a harp and a blurred effect that happens. They both want to keep her so the rest of the movie revovles around that. Hopefully all of this will jog someone's memory I've searching for this movie for years!