INS and type 2 diabetes mellitus: Several possible mechanisms link poor sleep quality to impaired glucose metabolism and other cardiometabolic risks factors.6 7 In one study, three nights of laboratory-controlled sleep fragmentation without changing total sleep duration showed a 25% decreased insulin sensitivity8; comparable to a difference in type 2 diabetes risk associated with being 8–13 kg heavier.9 This suggests an adverse effect of poor sleep quality independent of total sleep duration.