Figured since I get a few requests for these (but have never filmed an entire video because I can't time my grumbles), I would post a clip of one really long tummy grumble sequence! hehe
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