White torture is a type of psychological torture that includes extreme sensory deprivation and isolation. Unprovoked seizures may be triggered by stress or sleep deprivation. Administration of methionine ameliorated the pathological consequences of methionine deprivation. Caffeine can delay or prevent sleep and improves task performance during sleep deprivation. Drew and informs him that Marlo was suffering from extreme sleep deprivation and exhaustion. These may include factors such as hormonal changes and sleep deprivation. These metabolic stresses include hypoxia, nutrient deprivation, and an increase in proliferation. The torture depicted includes beatings, food deprivation and waterboarding. Research suggests that snoring is one of the factors of sleep deprivation. It also may be facilitated by fatigue or sleep deprivation. Sometimes more extreme methods are used to increase suggestibility, such as sleep deprivation or drugs. There are also positive consequences of REM deprivation. Claims of partial sleep deprivation are better documented. Punishments included such actions as dismissal, deprivation of salary, or even beatings. Studies have been conducted to test the effect of sensory deprivation on the brain.