Cranial electrotherapy stimulation (CES) is a form of neurostimulation that delivers a small, pulsed, alternating current via electrodes on the head.[1] CES is used with the intention of treating a variety of conditions such as anxiety, depression and insomnia.[1] CES has been suggested as a possible treatment for headaches, fibromyalgia, smoking cessation, and opiate withdrawal,[1] but there is little evidence of effectiveness for many of these conditions and the evidence for use in acute depression is not sufficient to justify it.[2]