Let's see where my ancestors came from! My mom and brother both had tests like this done. I'm curious to see what my results are. It'll take 6-8 weeks to get the results back, so we'll have to wait a bit, but we'll go over them when they come!
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