Genome-wide association analysis of self-reported daytime sleepiness identifies 42 loci that suggest biological subtypes. - Wang H; Lane JM; Jones SE; Dashti HS; Ollila HM; Wood AR; van Hees VT; Brumpton B; Winsvold BS; Kantojärvi K; Palviainen T; Cade BE; et al. (Nature communications, 2019)