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. 2019 Apr 24;1(2):226–239. doi: 10.3390/clockssleep1020020

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Changes in individual participants’ total PSQI scores from 8- to 12-h shift rosters. Continuous line: increased; dotted line: decreased; and dashed line: unchanged PSQI total score.