Cranial Electrotherapy Stimulation (CES) is an electromedical modality developed for the treatment of anxiety, depression and insomnia.  During a CES treatment, a mild electrical stimulus is applied transcranially with electrodes attached to the head. CES evokes changes in neurotransmitter and endorphin release, effecting changes in brain chemistry. Numerous studies indicate that CES successfully stimulates serotonin and dopamine production — the two primary neurochemicals responsible for mood and sleep.