Indeed, despite its natural origins, the sound of rain is quite consistent and predictable – and that’s what makes it so relaxing. “Like how music affects ... also make it soothing to ...
Just say, “Open CBeebies and play the calming sounds of… waves / birdsong / rain / car journey / spaceship / white noise / pink noise / brown noise.” ...
To induce sleep (a delta brainwave of 5 hertz), a person may need to devote at least 45 minutes, in a relaxed position, listening to calming music ... mind even when played moderately loud. Sounds of ...