via Live Science:
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Hundreds of thousands or millions of Americans believe they have been abducted by aliens. In a typical case, an abductee recounts lying in bed one night when an eerie feeling overcomes him, and alien beings appear out of nowhere. The extraterrestrials transport him to a spacecraft and subject him to a battery of physical and psychological tests. After what seems like hours, he is returned to his bedroom unharmed, and finds that the whole ordeal transpired in minutes.
Abductees think their traumatic experiences were real. However, most psychologists think abductions are lucid dreams or hallucinations, triggered by an awareness of other people’s similar experiences. One recent experiment, in which participants trained in lucid dreaming techniques were able to dream up vivid alien encounters, supports this hypothesis. But if each perceived abduction is just the latest in a series of hallucinations, what was it that triggered that first dream or delusion?