Secret Idea (dun dun DUN) + Help Needed

[Simpanra]

Ok, so i have this little idea going which i am going to keep up my sleeve for a little longer, however i need some help, i have something i need to do which will greatly improve the effect i am aiming to achieve. So, cutting to the chase (or in Amnesia terms, the chase is cutting you into salami), I need to create an area (approximately 5 or 6 metres long) in which your character looses a certain amount of his sanity, but i need it so that once you leave that area your sanity returns ASAP. I need his sanity to lower to the point where objects appear to go all "wobbly" and swirl around =) I really hope you guys can help me with this because i think my idea is quite unique (i haven't seen anything like it on the forums).

Thank you so much guys =)
Edd,