BMAL1 and attention deficit-hyperactivity disorder: In the ADHD group, chronotype and Bmal1 gene expressions were positively correlated, at ZT4 (rs = 0.714, p = 0.004) and ZT8 (rs = 0.892, p < 0.0001), as well as Cry1 (ZT8, rs = 0.544, p = 0.044) and Clock at ZT12 (rs = 0.620, p = 0.018).