Table 1.

Content of the SMILE intervention

Session	Content
Session 1	Introduction – Sleep education and hygiene - Biology of sleep, effects of sleep deprivation, importance of sleep in physical and mental wellbeing - Sleep hygiene (behaviours that promote healthy sleep), e.g., sleep schedule, avoiding daytime napping, and limiting coffee and substance use - Stimulus control (strengthen the bed as a cue for sleep) - Sleep restriction (limiting the hours in bed) - Homework: Applying the sleep hygiene rules and adjusting the sleep schedule based on sleep restriction if necessary
Session 2	The Mind – Dealing with negative thoughts - Concept of cognitive arousal and its impact on sleep - Cognitive behavioural techniques (e.g., thought records) - Dysfunctional thoughts about sleep or non-sleep related - Constructive worrying and positive refocusing - Homework: To complete the thought record exercise and/or the constructive worrying exercise
Session 3	The Body – Relaxation and Mindfulness - Dealing with stress and arousal - Deep (diaphragmatic) breathing - Progressive muscle relaxation - Mindfulness practice directed at challenging automatic reactions to stress, increasing awareness to the present moment, and letting go of negative thoughts associated with sleep - Homework: Practicing a mindfulness or relaxation exercise at least once a day through one of the suggested exercises. Filling out the mindfulness worksheet and the relaxation worksheet
Session 4	The Whole – Lifestyle Issues - Cognitive and behavioural patterns influencing sleep - Dysfunctional coping, such as substance use (alcohol, drugs, smoking) and emotional eating - Lifestyle topics such as flexibility and planning, perfectionism, burnout, diet, self-acceptance - Emotion focusing and processing - Summary and relapse prevention plan - Homework: Applying the knowledge and exercises of this intervention in daily life and using the relapse prevention plan