Hi Tweedles. I asked on Twitter what questions you would like to ask My Husband. It stemmed from a live stream. So here is My Husband answering your questions. This is just Bonus Content and will not affect tomorrows upload.
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