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First, you cannot patent sleep deprivation or light, so there is little financial incentive to invest in this treatment or research. That seems shortsighted to me. Research into altering the circadian clock to produce powerful antidepressant benefits could lead to the development of drugs that might mimic the effect of sleep deprivation, but without its obvious drawbacks. Beyond that, doctors don’t learn much about chronobiology in medical school or residency. There are only a handful of doctors and medical centers that administer these treatments. - www.nytimes.com