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. 2018 Feb 8;8:2636. doi: 10.1038/s41598-018-21067-9

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© The Author(s) 2018

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Additional example of an apnoea executed in a lucid dream during sleep. A patient performed a 9-second-long central apnoea surrounded by two ocular codes in REM sleep. This respiratory behaviour was congruent with her subsequent dream report that she held her breath to avoid smelling a poisonous odour while walking in the city’s subway. The breath immediately preceding the apnoea appears bigger and sharper than the previous ones on the flow tracing and the abdominal displacement tracing, suggesting preparation/planning.