“…Although sleep problems are common in young children (Mindell, Sadeh, Kwon, & Goh, ), only in recent years have these problems been linked to adjustment in preschool settings. The findings, however, are mixed: Some studies showed that sleep problems are positively associated with externalizing behaviors (Anders, Iosif, Schwichtenberg, Tang, & Goodlin‐Jones, ; Jackman et al, ; Paavonen, Porkka‐Heiskanen, & Lahikainen, ) and negatively associated with preacademic performance (Liu et al, ; Ravid, Afek, Suraiya, Shahar, & Pillar, ; Yorkbik, Mutlu, Koc, & Mutluer, ), whereas other studies documented null associations between sleep problems and behavioral and academic adjustment (Jackman et al, ; Jung, Molfese, Beswick, Jacobi‐Vessels, & Molnar, ; Romeo et al, ). One possible explanation for the inconsistent findings is that sleep problems are multidimensional (Ackerman & Brown, ): Different types of sleep problems may have different implications for youth adjustment, and the common practices of focusing on just one or two types of sleep problems, or aggregating multiple types of sleep problems into one single variable, may not be able to capture such nuances.…”