[berenice]

Let me explain what I understand about this:
1.- the world is a description given at birth, only a description
2-. when you are awake, you interact with the world under that codes, under that description, and it can be verified by those around you because they also have that same description of the world, they have the same codes, unified by reason.
3.- But when you are dreaming, nobody can verify what you are living (dreaming) because you are the only one who knows the codes of your dreaming. If you are not a dreamer, you are not able to interpret your dreaming, wich means your dreaming is something like useless. If you are a good dreamer it means you are able to interpret and give order into your dreaming, which means is being useful.
Is like creating an observer through your dreaming but also through your reason.

What makes both these posible, Cause we can see Waking and Dreaming but what makes them exists?

I don't know what makes them exist but I think it is our description of the world what makes the exist in separate ways.
Of course, this is only my humble opinion.

Berenice