Christian Bale’s perverse loss of weight (about 63 pounds) to star in this eerie psychological thriller is the most shocking element here, but not the only riveting one, as a machine-shop worker’s insomnia slithers into insanity. Trevor Reznik (Bale). He finds sanctuary of sorts in the bed of a hooker (Jennifer Jason Leigh) and on a counter stool at a late-night diner patrolled by a nurturing, widowed waitress (Aitana Sánchez-Gijón). Reznik’s declining physical and mental condition erupts into a full-blown nightmare of guilt, fear, confusion and paranoia when his co-workers ostracize him following a workplace accident. M.H.