Dark therapy

Dark therapy, also called scototherapy, light restriction and darkness therapy, is a treatment which involves eliminating all light, or all blue light, in a subject's environment, for a period of several hours prior to bedtime. Dark therapy manipulates the circadian rhythms acting on hormones and neurotransmitters. It has been proposed recently (2005) to combine the chronobiological manipulations of light/dark and/or sleep/wake therapies with psychopharmacological medication for depression as well as for circadian rhythm sleep disorders. In the words of Anna Wirz-Justice: