The aim of the study is to compare the implementation and effectiveness of group and self-help based cognitive behavioral treatment for insomnia (CBT-I) delivered by occupational health services (OHS) in a randomized and controlled design (RCT) among different types of shift workers.
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Changes over the measurement points in Insomnia Severity Index (ISI)
Timeframe: Baseline, immediately after intervention and 3-, 6-, 12- and 24-month follow-ups