Hello. I'm glad to see you here today. I hope you'll remember to subscribe to the channel before you go to sleep. That way you won't miss a new video. It can also help if you turn on notifications for new videos.
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