I'm no singer but I myself looove listening to lullaby type things, and our nights tend to look a little something like this anyway so I decided to share some of that with you... Hopefully you can relax as much as she did haha! Sweet dreams!!
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