Keep your audio muted too, maybe even make a schedule for it to automute when your wife sleeps :)
Don't surf from the bed, get up, do something, and get back to the bed when you are ready to sleep. (nope, I am not your wife even if I sound like her :)
Now that I've fixed your problems, how do I get back to sleep after I wake up or get woken up at 3-4am? :)
There's no autoplay audio for me. I just tried on Firefox for Windows (desktop) and Chrome on Android (mobile, obvs). Did you click on the video by accident maybe?