Multivariable regression (MVR) and one- (1SMR) and two-sample Mendelian randomization (2SMR) analyses indicate that frequent insomnia symptoms can cause higher hemoglobin A1c (HbA1c), according to a study published in the April issue of Diabetes Care. Junxi Liu, Ph.D., from the University of Bristol in the United Kingdom, and colleagues examined the effects of five self-reported sleep…