Your guardian angel is here to make you feel better Sorry for the clicking noises and grogginess of my voice, I'm a bit sick so it's all coming from my throat. I got a new silent mouse so I know it's not that.
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