I'm really into dreams. It's something I look forward to at night, and I tend to remember my dreams. I explain a few here. (Sorry, around 4:40 a train comes through and rumbles for a bit. I had to cut out about 4 mins because it got so loud. Hate living here.)
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