“…Children with developmental disabilities (DDs) commonly experience severe and persistent sleep problems (Bonuck and Grant, 2012; Sutton, 2011; Tietze et al, 2012), which are associated with negative outcomes for the child (e.g. daytime challenging behaviour and impaired educational performance) (Beresford et al, 2012; Galland and Mitchell, 2010) and the family, for example, increased stress and relationship difficulties (Bourke Taylor et al, 2013; Richdale et al, 2000; Tietze et al, 2012).…”