Although not intended this film makes a great horror movie. The Machinist takes you inside the mind of a very disturb individual. This film is really graphic and rumor has it that Christian Bale nearly died while making it because he had to starve himself, living off of only two apples a day in order to play the demented Trevor Rezink.
The movie revolves around Trevor an insomniac who has not slept properly in over a year. This severe lack off sleep is messing with his brain causing him to have horrible hallucinations and to become extremly paranoid.
Trevor lives a bleak life but what is even more troubling is the pain you see Trevor go through when he struggles to perform everyday tasks. Its almost as if in any second Trevor will drop dead from malnutrition.
Although the ending solves the mystery of what is causing Trevor's sleepless nights, it does not quite deliever. It is as if Trevor went through all his pain for nothing. If anything I recommend this movie because it shows an actor who is so committed to his craft that he was willing to undergo hell in order to play a role in a movie that is mediocore at best.