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Polysomnographic studies have been performed to investigate the first‐night effect in insomnia disorder. However, these studies have revealed discrepant findings. This meta‐analysis aimed to summarise and quantify the characteristics of the first‐night effect in insomnia disorder. We performed a systematic search of the PubMed, Medline, EMBASE, Web of Science and PsycINFO databases to identify studies...
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