Decided to recreate an older video that got a lot of positive feedback! I have two versions of this saved that I will share. Personally I love ASMR videos that have audio and visual effects to give that "trippy" or "hypnotic" feel, but I know some would prefer without so you can take your pick (:
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