Wake Up
Run into oneself in a dream and you'll definitely wake up.
If you run into yourself, it really messes you up, you know? You won't be able to handle what you're seeing so you have to wake up.
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お
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If one runs into oneself and you don't wake up, just look down at your waist. If you're wearing an obi (お) you know it's a dream and you'll eventually wake up. If you aren't wearing an obi then it isn't a dream and you don't have anything to wake up from.
Your obi is like a special object you only have in dreams. If you have your obi, it's okay, it's a dream and you can wake up now! Make sure you memorize exactly how it feels so dream-you can't trick you or something.