It's very real and I've accidentally done it twice - note that it can cause temporary sleep paralysis if it fails . First time I was not sure what was happening as the dream broke and I was in sleep paralysis for a minute - basically was awake and couldnt move my body, with a feeling as if a ghost was holding my body down - scared the shit out of me. Apparently the best way to get out of sleep paralysis is to just focus on moving one small part of ur body e.g. pinky finger - that tells your brain that you are awake and slowly removes you from the paralysis . I'm no expert on this but that's what i've read/heard.
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