KAT6A and Kabuki syndrome: Overall, our results suggest sleep dysfunction is common among those with WSS, in line with recent cross-syndrome investigations involving rare genetic disorders including Smith-Magenis, Fragile X, Angelman, Prader-Willi, Cornelia de Lange, CHARGE, Williams, KAT6A, and Kabuki syndromes (Angriman et al., 2015; Kaufmann et al., 2017; Agar et al., 2021; Budimirovic et al., 2021; Smith and Harris, 2021; Veatch et al., 2021; Rapp et al., 2022).