This was my go-to video to put me to sleep, but it has sound effects and I found other videos. The two others are Clayton Christensen's talk at Google, and John Danaher's appearance on the Lex Fridman podcast. These two are just amazing as the dynamic range of everyone's voice is so narrow. They don't have ups and downs. Their voice is rather monotonic and soothing. I'm asleep in less than 5 minutes. I know because I remember the topic I slept to, and diff it with the topic I haven't listened to.

I also listen to old tool restauration videos/CNC/industrial sounds as they put me to sleep as fast if I haven't booked a hotel room on the first floor of a hotel that gives to a busy city street at peak time, or at a specific place that overlooks a mechanic shop with pneumatic tools during work hours. I can't control traffic or people's work hours, so these videos are the closest I got to reproducible, predictable, on-demand sleep.