What I experienced was vivid and distinct. So, it could have been hypnogogic.
Do you mean when you were transitioning from REM sleep to consciousness, or from consciousness to REM sleep? The former is hypnopompic, the latter is hypnogogic.
I'd think in most instances that it's a hypnopompic hallucination that can be the most vivid, simply because outside- and very real sensory issues can accompany and amplify one's dream state. Also that it's a state where one is far more apt to recall the dream as they reenter a conscious state in real time.
In hypnogogic hallucination, one is losing awareness of real-world sensory concerns into their own mind. It might be vivid, but that's assuming that at a later time one can even recall the dream itself, as opposed to abruptly coming out of a dream.
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