Many who have had difficulty falling asleep have had good results when using binaural beats as a sleep aid. Discovered in the 1830s, binaural beats are a perceived beat that results when different tones are played in each ear. This soothing beat is of the same frequency that the brain reaches when it is in a state of rest or sleep. Listening to this frequency during bedtime is thought to gently lead the brain past its active state, and into a calmer, more restful state, conducive to sleep.MP3 player comes preloaded with binaural beat, and includes low profile ear buds (good for side sleepers), and wall charger.