Shall we rush to be brief? Methodological and clinical costs of shortening insomnia scales

This brief article addresses the increasing tendency to shorten self-report instruments in insomnia research and clinical practice, with a focus on the methodological and clinical implications of extreme scale abbreviation. Drawing on psychometric theory and empirical examples from insomnia research, it is argued that uncritical item reduction may compromise construct representation, limit symptom-level analyses, and reduce the clinical informativeness of self-report measures.