Solace Lifesciences Inc Nucalm Relaxation System - Sleep ...

https://www.youtube.com/playlist?list=PLCaDqPuPn3UxyIyQIExfNopburEPWgzoT

I would listen, through headphones, to binaural beat music music with two different balanced pulses that activates Alpha and Theta brain waves, which are related to the first phase of deep sleep and meditation.