My pitch for a new horror movie

The man of my nightmares

It begins with a teenage female aged sixteen has been having dreams about a male in in a brown cloak, bald torturing and brutally murdering other female teenagers in every room of her house, and saying she swears she has seen the man at the bottom of her bed, and every night these dreams progress to each room of her house. She is very scared of these dreams and plucks up the courage to tell her five closest friends at school, they think it is rather halarious and put it down to her just having nightmares and one of her friends suggest a sleep over to 'catch' this evil ghost she says she has seen, and one of them will bring along a video camera for footage. Coincidently her parents are away for the weekend at a wedding.
At the actualy sleep over it is just like any other, they are in the living room, chatting eating lots of food, fooling around with the camera when one of the girls sees something while filming. They look back at it and the female protagonist syas that thats the man she has been dreaming about, suddenly all the power goes off and another one of her friends goes to sort out the power so she goes through the see through sliding dorr and when she closes it she is then attacked by and has a very slow and gorey death while her friends sit and watch as the only way out was through the sliding door and it is somehow locked. the female protagonist looks in to the mirror in that room just to look away and sees the face of the man and shouts "Thats the man from my nightmares".
These sotuation happen to all of her friends in all the rooms she had dreamt about. She is very distressed and calls the police but as the only witnesses of he rstory are dead and there is no evidence that anyone else was there and she is the only surviver she is then arrestted for the brutal murder's and when put in to the police car she looks up to the bedroom window and sees the ghost standing there.