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Hallucinations right before entering a state of sleep are called hypnogogic hallucinations -- like hearing something that shakes you up just as you were drifting off? That's typically thought to be some kind of preemptive dream activity. Similar to hypnopompic hallucinations which happen just as someone has awakened. Those are experienced by plenty of people without mental disorders, though the "hallucination" part is typically thought of as a mental symptom. I'm quite sure this would be classified as a sleep disorder & might be corrected by a sleep medication.
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