|Christian Bale||Trevor Reznik|
|Jennifer Jason Leigh||Stevie|
|Reg E. Cathey||Jones|
|Anna Massey||Mrs. Shike|
Factory worker Trevor Reznik suffers from insomnia so severe that his condition has taken its toll on his weight and his mental health. When Trevor unintentionally causes an on-the-job accident that horribly injures a coworker, he begins to become even more troubled. Despite a relationship with Stevie, a pretty prostitute, Trevor descends further into paranoia, blaming his problems on an enigmatic figure named Ivan .