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Published in: International Archives of Occupational and Environmental Health 5/2020

Open Access 01-07-2020 | Insomnia | Original Article

Cognitive behavioural therapy interventions for insomnia among shift workers: RCT in an occupational health setting

Authors: Heli Järnefelt, Mikko Härmä, Mikael Sallinen, Jussi Virkkala, Teemu Paajanen, Kari-Pekka Martimo, Christer Hublin

Published in: International Archives of Occupational and Environmental Health | Issue 5/2020

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Abstract

Introduction

The aim of the study was to compare the effectiveness of cognitive behavioural therapy interventions for insomnia (CBT-I) to that of a sleep hygiene intervention in a randomized controlled design among shift workers. We also studied whether the features of shift work disorder (SWD) affected the results.

Methods

A total of 83 shift workers with insomnia disorder were partially randomized into a group-based CBT-I, self-help CBT-I, or sleep hygiene control intervention. The outcomes were assessed before and after the interventions and at 6-month follow-up using questionnaires, a sleep diary, and actigraphy.

Results

Perceived severity of insomnia, sleep-related dysfunctional beliefs, burnout symptoms, restedness, recovery after a shift, and actigraphy-based total sleep time improved after the interventions, but we found no significant differences between the interventions. Mood symptoms improved only among the group-based CBT-I intervention participants. Non-SWD participants had more mental diseases and symptoms, used more sleep-promoting medication, and had pronounced insomnia severity and more dysfunctional beliefs than those with SWD. After the interventions, non-SWD participants showed more prominent improvements than those with SWD.

Conclusions

Our results showed no significant differences between the sleep improvements of the shift workers in the CBT-I interventions and of those in the sleep hygiene control intervention. Alleviation of mood symptoms seemed to be the main added value of the group-based CBT-I intervention compared to the control intervention. The clinical condition of the non-SWD participants was more severe and these participants benefitted more from the interventions than the SWD participants did.

Trial registration

ClinicalTrials.gov, NCT02523079.
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Metadata
Title
Cognitive behavioural therapy interventions for insomnia among shift workers: RCT in an occupational health setting
Authors
Heli Järnefelt
Mikko Härmä
Mikael Sallinen
Jussi Virkkala
Teemu Paajanen
Kari-Pekka Martimo
Christer Hublin
Publication date
01-07-2020
Publisher
Springer Berlin Heidelberg
Published in
International Archives of Occupational and Environmental Health / Issue 5/2020
Print ISSN: 0340-0131
Electronic ISSN: 1432-1246
DOI
https://doi.org/10.1007/s00420-019-01504-6

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