We have an amazon alexa echo thingamajig. We play rain sounds, thunderstorm sounds, cricket sounds, beach/wave sounds, etc... Whatever we are in the mood for that night. My little guy seems to fight sleep less and sleep better with the sounds playing.

What we use is YouTube meditation videos. Our son falls asleep for naptime within 10 mins everyday. We couldn’t use devices that played music because he would have a need to play with the lights and would meltdown over them. It was too much stimulation.