It may be safe to say that the medication is one of the causes of psychosis because it caused the sleep deprivation. But, when I was taking the medication at the recommended dosage, I never failed to sleep less than 6 hours a night. It was only when the medication was frequently overused, that enough sleep deprivation took place to cause psychosis. The medication on its' own, when used properly never once caused even the slightest symptoms of psychosis.