Sleep Initiation and Maintenance Disorders

The grounding supports association with other medical or psychiatric conditions, but does not provide a specific causal aetiology for sleep initiation and maintenance disorders as a category. For insomnia disorder specifically, the literature links vulnerability to genetic variants, early life stress, major life events, and brain structure and function. It also suggests that brain circuits regulating emotion and arousal may be more relevant than circadian or homeostatic sleep circuits.

The literature describes impaired sleep initiation and maintenance in terms of altered vulnerability within brain circuits regulating emotion and arousal. It also notes links with stress, anxiety, depression, and broader mental health effects, consistent with a disorder involving both sleep disruption and daytime emotional/cognitive consequences. Actigraphy and polysomnography are discussed as assessment tools, but they are diagnostic rather than mechanistic.

For insomnia disorder, the grounding identifies female sex, genetic variants, early life stress, major life events, and vulnerability related to brain structure and function. Stress, anxiety, depression, and psychological pressure are also repeatedly associated with sleep disruption. The literature also notes comorbidity with other medical or psychiatric conditions.

Cognitive behavioural therapy for insomnia is recommended as first-line treatment for chronic insomnia in adults, including those with comorbidities. The grounding also supports use of sleep questionnaires, diaries, clinical interview, and physical examination for diagnosis, with polysomnography reserved for suspected other sleep disorders or treatment-resistant insomnia. Actigraphy may have a role in differential diagnosis or medical care, but is not recommended for routine evaluation.