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. 2020 Mar 24;11:527. doi: 10.3389/fpsyg.2020.00527

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Copyright © 2020 Bjorøy, Jørgensen, Pallesen and Bjorvatn.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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A total of 113 887 people responded to parts of, or the entire questionnaire. In all, 3 309 participants who reported that they previously had completed the survey, got their second responses removed from the data. A total of 78 577 participants answered questions about insomnia disorder, of which 64 503 (82.1%) fulfilled the insomnia criteria according to DSM-5. The prevalence of the specific insomnia subtypes among the participants who met the criteria for chronic insomnia disorder is shown: SOL, sleep onset; WASO, wake after sleep onset; EMA, early morning awakening.