Hope this is relaxing. For those interested: Crinkly plastic starts at 8:10. Pointer starts at 19.44. I seem to learn something new with every video I make... never knew the words 'Standing on the Shoulders of Giants' was written around the edge of our £2 coins.
To listen while using other apps, switch the player to Picture-in-Picture (PiP) during playback — it keeps playing in a small floating window (the screen stays on).
To listen with the screen fully off, in-browser playback stops by YouTube's design. Open the video in the YouTube app to keep listening where background playback is supported (e.g. with YouTube Premium).
Open in YouTube app