“…Multiple studies have shown that improved retention of vocabulary, phonological learning, and language comprehension skills are associated with greater amounts of sleep both in neurotypical children (Axelsson et al, 2016; Henderson et al, 2012) and in children with various developmental disorders (Axelsson et al, 2013; Edgin et al, 2015; Fletcher et al, 2020; Greiner de Magalhães et al, 2020; Knowland et al, 2019). Conversely, it has been shown that children who sleep less have more trouble with consolidation of different elements of memory associated with speech, such as phoneme recognition, vocabulary, and semantic knowledge (Axelsson et al, 2016; Bonuck et al, 2021; Henderson et al, 2012). Most studies of cognitive development and language acquisition, however, suffer from low numbers of participants and lack of longitudinal data.…”