Some of my favorite videos are the first person "scalp" scratching ones, so I thought I'd give it a shot. There's a bit of table and camera tapping too, but mostly scratching sounds. Sorry if the video itself isn't too interesting, I need to experiment some more with the camera and mic setup.
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