GCK and MODY: One study investigating sleep quality in adult MODY participants (pathogenic variants in GCK, HNF4A, HNF1A, and HNF1B) (n = 24, mean age 46.0 years, 79% women, BMI 24.7 kg/m2) who underwent actigraphy and answered sleep questionnaires revealed that 88% participants had poor sleep quality measured using PSQI.