Study Design and Settings
sleep disorders
This prospective interventional study aimed to evaluate the effect of internet-delivered CBT on shift workers with a high risk of sleep disorders. This study involved shift workers, including physicians and nurses, employed in 2 ICUs in Japan. Participants were instructed to wear a wrist-worn fitness tracker 24 hours a day and answer daily questionnaires about their well-being and activities. Internet-delivered CBT was provided through an app installed on the participants’ phones. We compared the total sleep duration, subjective well-being, and other variables in the baseline and intervention periods.The participants were recruited using flyers and email, both including the same content that stated the aim of the research project, the participant’s eligibility requirements, intervention methods, and participant’s rights. The emails were distributed by the head of the department to all employees. The flyers were handed out at staff meetings. After the flyers and emails were distributed, a research assistant asked all eligible employees about their intention to participate. After inclusion, the participants were completely anonymous to the study team and sleep physicians who reviewed the participant’s data and provided sleep advice (see details in the 