Trevor Reznik (Christian Bale - Batman Begins) has not slept for a year. Ravaged by fatigue, his body is little more than a bag of bones. Wracked by exhaustion, his weary mind increasingly plays tricks on him. Then one fateful day at the machine shop where he works, he's involved in an accident and a fellow worker loses an arm.

Reznik's guilt turns to paranoia when he discovers cryptic notes in his apartment and a ghostly apparition haunts his every move. Is it someone out to exact revenge for the gruesome accident? In a desperate attempt to save his sanity, Reznik must uncover the truth...but the more he learns, the more terrifying his sleepless nightmare becomes.