Ever find yourself falling asleep to a YouTube video only to wake up hours later with your history filled with auto-playing next video after auto-playing next video? Well, in that case you probably need a sleep timer, and luckily YouTube is now offering just that. But it's limited to YouTube Premium subscribers. And it's an experimental test feature. And, perhaps most annoyingly, the test is only running until September 2. After that, the feature might make it into YouTube per se, shedding its experimental training wheels, or it could disappear forever, there's absolutely no telling at...

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