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You can call it a mental image if you are awake, or a dream if you are asleep. If you get this kind of vivid picture while you are in the process of waking or falling asleep, you might call it a hypnopompic or hypnagogic hallucination. Otherwise, it could be called an hallucination if it is connected with some pathological or drug related cause.

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∙ 13y ago

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