Trigger Warning: Implied Doing Bad Things to Oneself from Speaker's End EDIT: In case it's too cryptic, when you fall down and get hurt, you can use alcohol to make sure you're not going to get an infection. Don't worry, although normally I'm very realistic about object things, no people were harmed in the making of this video
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