this doesn't sound like anything the general populous would use: a big part of twitch is the interaction between the chat and the broadcaster. if a broadcaster has the intent to put you to sleep, then beg them not to host somebody who will "jar" you awake. otherwise, it's your own fault for being careless. maybe try looking for another app that will turn your phone off after a set duration or watch an asmr video on youtube before bed.

this sounds like it would take a long time to implement, will have many bugs and glitches that will be difficult to fix because they need to be done per device, and probably won't be used very often by anyone other than music Queens who hate the broadcaster's taste. music is kind of an important part of the stream, and if you turn it off then you're closing doors and losing connection with the broadcaster. what if everyone had muted brain power and darude sandstorm?