Amended post of Final idea

Girl wakes up, looks confused, shrugs it off and walks downstairs, again begins to look confused but carries on and ignores it, gets ready and walks out of the door cuts to her coming home, walks up the stairs and goes in her bedroom, cantered angle camera as she puts her things down and places her coat over the back of a chair, then gets in bed, when he wakes up his chair is gone and the coat is on the floor, she picks it up and puts it on without thinking about, she then has a moment of realisation and as she's leaving he turns round to stare at where she picked it up from, knowing that something is strange, she carries on as usual,

She no longer dare go to sleep, she knows that when she goes to sleep something is going to change, she sits at a table, her eyes are dark and bloodshot and her hair is a mess, you can see both the fear and tiredness in her eyes, lots of empty energy drink cans, and tablets scattered around the table, eventually she can't stay awake no more she falls asleep and this is when the worst happens, she wakes in a completely unfamiliar room and panics, she knows something is going to have happened and daren't do anything because she knows how it's going to be, she hesitantly leaves the room, and when she goes downstairs her family don't recognise her and are scared that there's a stranger in the house, she argues that she's their son but the Dad grabs him and drags him out of the house, 

Everything that changes goes into this room, like when the chair goes missing there is a chair in an empty room. Say if a pen went missing, there would be a chair and a pen. She wakes up from her sleep one day and then wakes up in the room. There is a close upshot of her eyes opening rapidly. The camera slowly pulls away from her face whilst you hear doctors voices saying 'She appears to be in a catatonic state." It could then cut to her in a mental state in the white room thumping on the doors screaming and kicking to get her out. This could represent her mental state. Everything she needs and wants to be a normal stable person seem to be going missing. This could also be a link to her brain. The things that the brain needs to function are slowly going and disintegrating.

She walks around the room and takes a seat somewhere and her eyes begin to water, it fades and cuts to flashbacks of happier times when she's with friends and family, always laughing, then the laugh continues in a graphic match, this time more sinister, as she's stood against a white wall, in a straight jacket with a light in her face (the light swings to emphasise his madness) and then it slowly fades out with her laughing all the time...