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. 2020 Aug 18;11:2172. doi: 10.3389/fpsyg.2020.02172

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Copyright © 2020 Sunde, Pedersen, Mrdalj, Thun, Grønli, Harris, Bjorvatn, Waage, Skene and Pallesen.

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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Estimated marginal means and standard error plotted as a function of light condition (2500 K vs. 7000 K light), night shift, and time of testing. (A) Rating on the Karolinska Sleepiness Scale (KSS). (B) Mean reciprocal response time (1/RT) on the Psychomotor Vigilance Task (PVT). (C) Number of lapses (RTs ≥ 500 ms) on the PVT. (D) Number of false starts (response without stimulus) on the PVT. (E) Number of correct responses on the Digit Symbol Substitution Test (DSST). *p < 0.05 between light conditions (only for variables with significant light × night × time interactions).