The goal of this clinical trial is to evaluate the usefulness of cognitive behavioural therapy for insomnia (CBT-I) tailored to shift workers in the social and health care sector. The study will also learn about the shift workers' experiences of the acceptability and feasibility of CBT-I and investigate which features of shift work and individual characteristics promote or interfere with the effectiveness of the tailored CBT-I. The main question the study aims to answer is: • Does CBT-I tailored to shift workers in the social and health care sector improve perceived insomnia severity, insomnia symptoms, mental health and quality of life? Researchers will compare CBT-I to a control intervention (short sleep hygiene counselling) to see if CBT-I works to treat insomnia in shift workers. Participants will: * Participate in the research intervention (CBT-I tailored to the shift work context; six individual sessions) or the control intervention (sleep hygiene counselling; one individual session) * Complete the measures (sleep diary, actigraphy and questionnaires) at baseline, after the end of treatment (12 weeks after the first session) and at 6 months after the end of treatment.
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Change from baseline in mean of Insomnia Severity Index at the end of treatment (12 weeks after the first session) and at 6 months after the end of treatment.
Timeframe: From baseline to the end of treatment (12 weeks after the first session) and to the 6 months after the end of treatment.