Provided is an apparatus, system, and method for targeted sleep enhancement. A computer processing circuit receives a plurality of EEG signals from a plurality of spatially separated EEG sensors configured to be located on the head of a subject. The computer processing circuit executes machine executable instructions to: receive and process the plurality of EEG signals; determine that the subject is in sleep stage 3 based on a specific EEG signal of the processed plurality of EEG signals; determine a period of at least one of quiescent and asynchronous brain activity of the subject, wherein the period is determined based on the processed plurality of EEG signals; and deliver a transcranial electrical stimulation through the plurality of stimulation electrodes during the period of quiescent brain activity.
METHOD FOR NON-INVASIVE ENHANCEMENT OF DEEP SLEEP