US Patent 11786694 Device, method, and app for facilitating sleep

A device, system, and method for facilitating a sleep cycle in a subject, comprising selecting a waveform from a plurality of waveforms derived from brainwaves of at least one sleeping donor, wherein said waveform corresponds to at least one specific stage of sleep; and stimulating the subject with at least one stimulus, wherein said at least one stimulus is at least one of an auditory stimulus and a visual stimulus modulated with the selected waveform to entrain the brain of the subject with the selected waveform to facilitate sleep in the subject.