title: Longitudinal studies of insomnia: current state and future challenges.
authors.forename: Jihui
authors.initials: J
authors.lastname: Zhang
authors.forename: Siu-Ping
authors.initials: SP
authors.lastname: Lam
authors.forename: Yun-Kwok
authors.initials: YK
authors.lastname: Wing
mesh_terms: D000203:Activities of Daily Living / Q000523:psychology*; D005260:Female; D006801:Humans; D008297:Male; D007319:Sleep Initiation and Maintenance Disorders / Q000523:psychology*; D012893:Sleep Wake Disorders / Q000523:psychology*