iAwake Technologies is a pioneer in research into brain/mind sound technology. I love thie products.  Each new production brings together music and technology to calm and bring peace to the brain.  They combine psychoacoustics (how we hear,  perceive physiologically respond to sound) and energy medicine. Without getting too technical, let me just say click the image below to download 40 minutes of free audio.   They have both an app for ios and android.  I’ll bet you’re gonna love it, I do.