Advances on sleep electroencephalogram in the subtyping and treatment of insomnia disorder
Insomnia disorder is a common clinical mental disorder.Currently,clinical subtyping of insomnia disorder relies primarily on symptomatic descriptions,lacking objective measures and subtyping-based treatment approaches.In recent years,increasing attention has been drawn to sleep electroencephalo-graphy(EEG)as a valuable tool for observing abnormal sleep architecture and continuity of insomnia disor-der.Sleep EEG analysis holds the potential to elucidate the underlying biological mechanisms of insomnia disorder,facilitating data-driven subtyping and enhancing personalized therapeutic strategies.Five types of sleep EEG subtypes of insomnia disorder were systematically searched and summarized:classifications de-rived from objective sleep duration,power spectral characteristics,cyclic alternating pattern,spindle and mi-croarousal.EEG characteristics of each subtype and clinical outcomes are discussed.This review aims to pro-vide evidence-based insights for clinical subtyping and personalized treatment of insomnia disorder.