but I am going to assume that it is like a dream world so it does not have to make sense.
Is it though? Because they don’t leave the world by waking up–they (almost) take a very literal magic bean that created a very literal portal back to their very literal Storybrooke. That’s the problem. If this was a dream world, then the bases are covered and we can handwave away all the wonkyness. But it was never stated as such. Belle was still asleep when she went to dream world, her subconscious traveled. But Emma and Regina–their very bodies and beings–traveled to this AU.
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"He was a lot of things to me" "The only conclusion was love"