I'm back!! I've returned with some hardcover book tapping and scratching with some page flipping mixed in! Also pardon any background noise you hear, my sister is playing music in her room. If you would like to request something, leave a comment and I will do it!
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