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. 2020 Apr 16;20:174. doi: 10.1186/s12888-020-02550-y

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© The Author(s) 2020

Open AccessThis 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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

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Fig. 1 — Next Day’s PTSS Predicted by the Previous Night’s Sleep Duration, Sleep Quality, Trouble Falling Asleep, and Difficulty Staying Asleep. Note. Least squares means of PTSS, adjusted for demographic characteristics and within-subjects correlations, estimated for each sleep variable with various levels of last night measures, shown as horizontal variables and stratified by different person mean measures. For sleep quality, the four lines of person mean measures reflect the four response options from 0 (Very bad) to 3 (Very good). For sleep duration, trouble falling asleep, and difficulty staying asleep, the three lines of person mean measures reflect the grand mean and one standard deviation above or below the grand mean. The grand means were 5.3, 1.4, 0.53, and 0.36 for sleep duration, sleep quality, trouble falling asleep, and difficulty staying asleep