The largest randomised controlled trial of a psychological intervention for a mental health problem found that treating insomnia led to a reduction in paranoia and hallucinations, providing strong evidence that insomnia may be a causal factor in the occurrence of psychotic experiences.

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The largest randomised controlled trial of a psychological intervention for a mental health problem found that treating insomnia led to a reduction in paranoia and hallucinations, providing strong evidence that insomnia may be a causal factor in the occurrence of psychotic experiences.