In response to the first portion of your post, as no-name said, it sounds like a classic case of sleep paralysis. During SP, people tend to have what's called "Hypnogogic Hallucinations" which can include but aren't limited to strange sounds, images, and feelings. A lot have mentioned that they feel a presence in the room when it happens, sometimes a ways away and sometimes pressing on their chest and making it difficult to breathe. It's often referred to as the "Old Hag" and if you search for that term, you're bound to find more information. You're not alone when it comes to this and I'm sure that if you stick around long enough, you'll find plenty of people who have gone through the same thing. 
As far as the dream/vision/? I don't have an answer. Dreams and pretty much anything mental is very subjective and individualistic. I'm doubtful of the existence of Astral Projection, and while it sounds like an unintentional WILD, I wouldn't say that it's not possibly a vision of some sort. I feel more people claim to have visions when they just have dreams, but at the same time I know that there are those who truly have a unique experience.
I would say to learn from what happened, but don't devote your life to trying to induce visions or contact the great will of the macrocosms. It sounds like a fantastic experience
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