Table 5.

Summary of components of the sleep hygiene module per session.

Session	Intervention Objectives/Components
Session 1	Goal-setting and action-planning: Objective specification and commitment Self-monitoring: Sleep diary Psychoeducation: What is sleep hygiene? Cognitive restructuring: Irrational, false or inaccurate beliefs about sleep Breathing and relaxation techniques: Diaphragmatic breathing and progressive muscle relaxation
Session 2	Review of behavioural goals, action plans, and compliance (participant’s homework) Self-monitoring: Sleep diary Psychoeducation: Voluntary sleep restriction; coffee, alcohol and tobacco consumption before sleep; and irregular sleep schedule and environment Cognitive restructuring: Irrational, false or inaccurate beliefs about sleep Review of diaphragmatic breathing and progressive muscle relaxation
Session 3	Review of behavioural goals, action plans, and compliance (participant’s homework) Self-monitoring: Sleep diary Vicarious and self-reinforcement: Changes in sleep habits achieved and benefits Stimulus control and bedtime restriction Review of diaphragmatic breathing and progressive muscle relaxation
Session 4	Review of behavioural goals, action plans, and compliance (participant’s homework) Self-monitoring: Sleep diary Vicarious and self-reinforcement: Changes in sleep habits achieved and benefits Review of all intervention components: Main factors of sleep hygiene, diaphragmatic breathing and progressive muscle relaxation, stimulus control and bedtime restriction Maintenance and relapse prevention: Analysis of high risk situations for unhygienic sleep.