(#94) I hope that you find this inaudible whisper relaxing since I love these kinds of videos! Sorry that it is kind of quiet (I will try to improve that for next time)!
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