Phillips, JGChow, YWOgeil, RP2024-10-212024-10-212023-11-25Ergonomics, ISSN: 0014-0139 (Print); 1366-5847 (Online), Informa UK Limited, 67(9), 1177-1189. doi: 10.1080/00140139.2023.22888080014-01391366-5847http://hdl.handle.net/10292/18158As sleep problems can impair quality of work, an online questionnaire was used to examine relationships between sleepiness and decision making while obtaining unobtrusive indices of performance. Participants (N = 344) completed the Insomnia Severity Index, Epworth Sleepiness Scale, and the Melbourne Decision Making Questionnaire in a Qualtrics survey while reporting mobile phone use. Qualtrics recorded the time and the number of clicks required to complete each page of the survey. Multiple regression indicated that insomnia was associated with daytime sleepiness and Hypervigilance, and mobile phone use before bed. Participants with moderate sleepiness required a greater number of clicks to complete the questionnaire. Greater sleepiness was associated with longer times to complete these self-assessment tasks. Clinically significant sleepiness produces changes in performance that can be detected from online responsivity. As sleepy individuals can be appreciably and quantitatively slower in performing subjective self-assessment tasks, this argues for objective measures of sleepiness and automated interventions and the design of systems that allow better quality sleep. Practitioner summary: Work can require processing of electronic messages, but 24/7 accessibility increases workload, causes fatigue and potentially creates security risks. Although most studies use people’s self-reports, this study monitors time and clicks required to complete self-assessment rating scales. Sleepiness affected online responsivity, decreasing online accuracy and increasing response times and hypervigilance.© 2023 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The terms on which this article has been published allow the posting of the Accepted Manuscript in a repository by the author(s) or with their consent.http://creativecommons.org/licenses/by/4.0/Insomniaerrorshypervigilancelapsesmobile phonesleepiness4203 Health Services and Systems42 Health SciencesSleep ResearchClinical Research1106 Human Movement and Sports Sciences1203 Design Practice and Management1701 PsychologyHuman Factors4201 Allied health and rehabilitation science4207 Sports science and exercise5201 Applied and developmental psychologyHumansMaleFemaleAdultSleepinessSurveys and QuestionnairesDecision MakingMiddle AgedSleep Initiation and Maintenance DisordersYoung AdultInternetSelf-AssessmentAdolescentHumansSleep Initiation and Maintenance DisordersDecision MakingInternetAdolescentAdultMiddle AgedFemaleMaleYoung AdultSelf-AssessmentSurveys and QuestionnairesSleepinessHumansMaleFemaleAdultSleepinessSurveys and QuestionnairesDecision MakingMiddle AgedSleep Initiation and Maintenance DisordersYoung AdultInternetSelf-AssessmentAdolescentJournal ArticleOpenAccess10.1080/00140139.2023.2288808