Advanced Sleep Phase Syndrome, Familial, 2, also known as advanced sleep phase syndrome 2, is related to retinal arteries, tortuosity of and spinocerebellar ataxia 6. An important gene associated with Advanced Sleep Phase Syndrome, Familial, 2 is CSNK1D (Casein Kinase 1 Delta). Affiliated tissues include brain, and related phenotypes are migraine and sleep-wake cycle disturbance