Bit tangential, but Google Nest's sleep sounds are really nice. I often suspect letting it run through the night significantly boosts the deepness of morning sleep. The hub's radar sleep sensing is pretty neat too.
Be that as it may be, plenty of people use Google products and may learn something.
the Google nest hub has a radar for sleep tracking, which I find really innovative. I don’t think they’re the first, but it’s a pretty common product and it works well. You point the screen at your bed, and the radar is sensitive enough to see if you’re laying down or moving a lot on your side of the bed. No wearing any watch, no expensive single-use device (eg a bed pad) and it can tell how restful the night was. I have no idea how accurate it is, but anecdata says it works well enough for casual use.