Evolution of Insomnia Diagnostic Criteria and Clinical Implications (cited)
Diagnostic Concept Shift
- The DSM‑5 (American Psychiatric Association) eliminated the primary/secondary insomnia distinction, defining insomnia as an independent disorder that may coexist with medical or psychiatric conditions, thereby changing diagnostic and treatment approaches. 1, 2, 3, 4
Unified Diagnostic Criteria
- DSM‑5 and ICD‑11 require sleep‑initiation, maintenance, or early‑morning awakening occurring ≥ 3 nights per week for ≥ 3 months, with adequate opportunity for sleep, clinically significant distress or daytime impairment, and exclusion of other sleep, substance, or medical explanations (American Academy of Sleep Medicine). 1, 2, 3, 4
- The term “Insomnia Disorder” consolidates previous subtypes into a single diagnostic category across DSM‑5, DSM‑5‑TR, ICD‑11, and ICSD‑3. 1, 2
Structural Changes in Classification Systems
- ICD‑11 (World Health Organization) reorganized sleep‑wake disorders into a dedicated chapter, removed the organic/non‑organic split, and merged insomnia subtypes into “Chronic Insomnia Disorder.” 5
- ICD‑11 incorporates dimensional severity ratings alongside categorical diagnosis to capture within‑category heterogeneity. 5
Special Populations
- ICD‑11 emphasizes caregiver input when assessing insomnia in cognitively impaired adults and pediatric patients. 6, 7, 5
Clinical Management Implications
- Current guidelines (American Academy of Sleep Medicine) mandate that clinicians treat insomnia disorder directly—typically with cognitive‑behavioral therapy for insomnia (CBT‑I)—rather than expecting resolution solely by treating comorbid conditions. 1, 2, 3, 4
- Documentation should list insomnia disorder and any co‑occurring psychiatric or medical diagnoses as separate, co‑existing conditions, not as a hierarchical primary/secondary relationship. 3, 4