Transcranial Alternating Current Stimulation (TACS) for Sleep Disturbances in Neurocognitive Disorders Due to Alzheimer's Disease

High-definition transcranial current stimulation (HD-tCS) is delivered by a battery driven direct current stimulator (DC-Stimulator Plus, NeuroConn, Ilmenau, Germany) through a central anodal electrode surrounded by four return cathodal electrodes.