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Why this is so remains a mystery. We propose that irregular breathing has a cortical origin and reflects the mental content of dreams, which often accompany REM sleep. We tested 21 patients with narcolepsy who had the exceptional ability to lucid dream in REM sleep, a condition in which one is conscious of dreaming during the dream and can signal lucidity with an ocular code. Sleep and respiration were monitored during multiple naps. Participants were instructed to modify their dream scenario so that it involved vocalizations or an apnoea, -two behaviours that require a cortical control of ventilation when executed during wakefulness. Most participants (86%) were able to signal lucidity in at least one nap. In 50% of the lucid naps, we found a clear congruence between the dream report (\n                    <jats:italic>e<\/jats:italic>\n                    .\n                    <jats:italic>g<\/jats:italic>\n                    ., diving under water) and the observed respiratory behaviour (\n                    <jats:italic>e<\/jats:italic>\n                    .\n                    <jats:italic>g<\/jats:italic>\n                    ., central apnoea) and, in several cases, a preparatory breath before the respiratory behaviour. This suggests that the cortico-subcortical networks involved in voluntary respiratory movements are preserved during REM sleep and that breathing irregularities during this stage have a cortical\/subcortical origin that reflects dream content.\n                  <\/jats:p>","DOI":"10.1038\/s41598-018-21067-9","type":"journal-article","created":{"date-parts":[[2018,2,2]],"date-time":"2018-02-02T06:24:52Z","timestamp":1517552692000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":39,"title":["REM sleep respiratory behaviours match mental content in narcoleptic lucid dreamers"],"prefix":"10.1038","volume":"8","author":[{"given":"Delphine","family":"Oudiette","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Pauline","family":"Dodet","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nahema","family":"Ledard","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Emilie","family":"Artru","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"In\u00e8s","family":"Rachidi","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2868-9279","authenticated-orcid":false,"given":"Thomas","family":"Similowski","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2240-2516","authenticated-orcid":false,"given":"Isabelle","family":"Arnulf","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2018,2,8]]},"reference":[{"key":"21067_CR1","doi-asserted-by":"publisher","first-page":"R172","DOI":"10.1152\/ajpregu.00238.2016","volume":"312","author":"RR Dhingra","year":"2017","unstructured":"Dhingra, R. 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