If say i had a friend sleeping next to me was dreaming something and i was too and we were both asleep could he go into my dream and actually spiritually or in some form be there. not just a figment of my imagination. and could we talk and hangout.
Well, yes, but not in the way you're probably thinking. Since we are always in the astral when we are dreaming, we are also in various levels, places, spaced, pockets, folds, whatevers. Often we are in a real astral location but our subconscious induces hallucinations which cloud our consciousness and gives the dream its illusionary/Alice-in-Wonderland feeling. These hallucinations can either act as an overlay to your perception (a kind of "dream goggles" thing) or you might actually construct dream images subconscious and so any other spirit in the vicinity will be able to see your dreams, in a sense.
In my experience, I do not think that anybody dreams in their own personal little bubble that only they have access to. This is the physical conception of dreaming, that we are in our brains and nothing more. This is not true. We are always in the astral for dreaming.
Now, as for interacting with others while dreaming, that is more than possible. In fact, chances are that you interact with many people each time you go to sleep. If there is someone on our mind a lot (this can be a friend, a relative, even an hated aquantance) then it's almost inevitable that we will interact with them as we sleep, since it is the nature of our subconscious to be drawn to people who are on our thoughts a great deal. In the astral, this becomes a literal, tangible force and you will find yourself drawn to certain people and places simply because they occupy a great space of your thoughts. In certain phases of sleep which lack the illusionary content of dreams, but still have the lack of consciousness, people have unimaginable adventures whilst they are dreaming in real locales with real people, but the catch is that we don't remember a thing when we wake up. Such a pity.
So in basic answer to your question, yes, it is possible to "enter" someones dream. All you have to do is go into the astral and find someone there who is sleeping. Voilá, you're in their dream. Whether they see you, hear you, feel you, or most important remember you, it is another matter entirely. Rest assured that the overwhelming majority of the time, they will not remember you. Doing this with someone who is also a practitioner of OBE's will increase the chances of remembrance, as well as trying to shock them somehow whilst they're dreaming so that you leave an impression.
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