I use this app nearly every day for meditation, napping, or sleeping. So reliable and easy to use. It works faster than chamomile tea for getting me back to sleep when I wake up in the middle of the night (usually less than 10 minutes).
Its the most useful tool and most-used app on all my devices. Ive used it with my own music as a background, but find the soft sounds of the tracks that are supplied with the app to be perfectly adequate.
Ive also used the programs for headache relief, euphoria, and creativity with varying degrees of success.
Meginfinity about BrainWave: 37 Binaural Series™, v7.4