Imagine, you are inside a dream, how can you check whether it's a dream or not? I asked my friend, she said in order to check this you need to look into palm, in a dream you can't see a hand in details.  It sounds similar to Leo's advise to look into hand to see a God in "What is Actuality?" video. I have a concept: the dream world (or the illusion of illusion), current reality (or illusion) and God (Reality) is a system inside a system inside a system (roughly speaking).
So, if you can realize that you are the creator of a dream in a similar way you can realize that you are God. Does someone have insights about it?