Employees with shift work disorder experience excessive sleepiness also on non-work days: A cross-sectional survey linked to working hours register in finnish hospitals

Päivi Vanttola, Sampsa Puttonen, Kati Karhula, Tuula Oksanen, Mikko Härmä

Research output: Contribution to journalArticleScientificpeer-review

7 Citations (Scopus)

Abstract

A considerable proportion of shift workers have work schedule-related insomnia and/ or excessive sleepiness, a phenomenon described as shift work disorder (SWD). There is yet a lack of evidence on whether or not employees recover from symptoms of SWD between work shifts. We studied whether SWD and its subtypes are associated with insomnia and excessive sleepiness during weekly non-work days and with 24-h sleep time. Hospital employees answered a survey on SWD, insomnia and excessive sleepiness on weekly non-work days, and 24-h sleep. To identify shift workers with night shifts (n=2,900, 18% with SWD) and SWD, we linked survey responses to employers’ register on working hours. SWD included three subtypes: insomnia only (SWD-I, 4%, n=102), excessive sleepiness only (SWD-Es, 8%, n=244), and both insomnia and excessive sleepiness (SWD-IEs, 6%, n=183). Based on regression analyses, SWD was associated with excessive sleepiness on non-work days (OR: 1.42, 95% CI: 1.07–1.88) and with insomnia on non-work days (0.53, 0.31–0.91). SWD-I was associated with excessive sleepiness on non-work days (2.25, 1.31–3.87) and with shorter sleep (7–7.5 h: 1.96, 1.06–3.63; ≤6.5h: 2.39, 1.24–4.59; reference: ≥8 h). The results sug-gest that especially employees with SWD-I may need longer time to overcome excessive sleepiness than allowed by their roster.

Original languageEnglish
Pages (from-to)366-374
Number of pages9
JournalINDUSTRIAL HEALTH
Volume58
Issue number4
DOIs
Publication statusPublished - 2020
Externally publishedYes
Publication typeA1 Journal article-refereed

Keywords

  • Circadian rhythm sleep-wake disorder
  • Epidemiology
  • Health care
  • Insomnia
  • International Classification of Sleep Disorders
  • Nurses
  • Registry
  • Shift work sleep disorder

ASJC Scopus subject areas

  • Public Health, Environmental and Occupational Health
  • Health, Toxicology and Mutagenesis

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