The Sleep Clinic Outcome and Practice Study

The goal of this clinical trial is to explore the outcome and practice treatment for sleep-wake disturbances in a Sleep Clinic. The main questions it aims to answer are: * What is the practice (timing and duration of treatment components) of sleep-wake disturbance treatment? * What is the treatment effect of sleep-wake disturbance treatment. Participants will receive treatment as usual by consultations with a trained psychiatrist or psychologist and will be asked to fill out self-reporting questionnaires and sleep diaries.