Latent classes of sleep deficiency and correlates among patients receiving methadone treatment: A longitudinal study. - Hsaio C; Jeon S; DiMeola KA; Walker K; Akhiwu O; Stein MD; Madden LM; Redeker NS; Scheinost D; Fiellin DA; Yaggi HK; Barry DT (Addiction (Abingdon, England), 2026)