Nucalm - Apps On Google Play
https://netflix.com-k.best/view/Ol3WFMcYXxM/what-if-you-were-alive-200-million-years-ago.html
I would listen, through headphones, to binaural beat music music with 2 various balanced pulses that sets off Alpha and Theta brain waves, which are associated with the very first phase of deep sleep and meditation.