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You can actually go back to your body, lay down on yourself and visualize yourself sinking back in, or you could just visualize yourself being sucked back in from wherever you are. You can also just focus on waking up. It's up to you. Now, if for some strange reason, you can't get back into your body, you'll probably begin to panic, and once you become upset enough, you should wake up automatically, as if you were having a bad dream or something.