I have a variety of sleep apps and music albums on my Kindle Fire HD and my iPhone. This is one of the top three I reach for consistently and I am always on the hunt to find new ones. I have to rotate through different sounds over several nights to get my brain entertained and on some nights, I have to switch between programs and sounds till I find one that will take me under. I smile when I hear this one go on. My brain likes it, and I like it because it shuts down my brain and I can thankfully sleep.