@article{ref1,
title="Sleep-wake behaviors exhibited by shift workers in normal operations and predicted by a biomathematical model of fatigue",
journal="Sleep",
year="2020",
author="Riedy, Samantha M. and Roach, Gregory D. and Dawson, Drew",
volume="ePub",
number="ePub",
pages="ePub-ePub",
abstract="STUDY OBJECTIVES: To compare rail workers' actual sleep-wake behaviors in normal operations to those predicted by a biomathematical model of fatigue (BMMF). To determine whether there are group-level residual sources of error in sleep predictions that could be modeled to improve group-level sleep predictions. <br><br>METHODS: The sleep-wake behaviors of 354 rail workers were examined during 1,722 breaks that were 8h to 24h in duration. Sleep-wake patterns were continuously monitored using wrist-actigraphy and predicted from the work-rest schedule using a BMMF. Rail workers' actual and predicted sleep-wake behaviors were defined as split-sleep (i.e. ≥2 sleep periods in a break) and consolidated-sleep (i.e. one sleep period in a break) behaviors. Sleepiness was predicted from the actual and predicted sleep-wake data. <br><br>RESULTS: Consolidated-sleep behaviors were observed during 1,441 breaks and correctly predicted during 1,359 breaks. Split-sleep behaviors were observed during 280 breaks and correctly predicted during 182 breaks. Predicting the wrong type of sleep-wake behavior resulted in a misestimation of hours of sleep during a break. Relative to sleepiness predictions derived from actual sleep-wake data, predicting the wrong type of sleep-wake behavior resulted in a misestimation of sleepiness predictions during the subsequent shift. <br><br>CONCLUSIONS: All workers with the same work-rest schedule have the same predicted sleep-wake behaviors; however, these workers do not all exhibit the same sleep-wake behaviors in real-world operations. Future models could account for this group-level residual variance with a new approach to modeling sleep, whereby sub-group(s) may be predicted to exhibit one of a number of sleep-wake behaviors.<br><br>© Sleep Research Society 2020. Published by Oxford University Press on behalf of the Sleep Research Society. All rights reserved. For permissions, please e-mail journals.permissions@oup.com.<p /> <p>Language: en</p>",
language="en",
issn="0161-8105",
doi="10.1093/sleep/zsaa049",
url="http://dx.doi.org/10.1093/sleep/zsaa049"
}