“UNC School of Medicine scientists report using transcranial alternating current stimulation, or tACS, to target a specific kind of brain activity during sleep and strengthen memory in healthy people.”
“Feedback-Controlled Transcranial Alternating Current Stimulation Reveals a Functional Role of Sleep Spindles in Motor Memory Consolidation” by Caroline Lustenberger, Michael R. Boyle, Sankaraleengam Alagapan, Juliann M. Mellin, Bradley V. Vaughn, and Flavio Fröhlich in Current Biology. Published online June 20 2016 doi:10.1016/j.cub.2016.06.044