“…genetic, maturational) and environmental factors are important in sleep development in infants, toddlers and preschoolers (Fagioli, Ficca, & Salzarulo, 2002;Fehlings, Weiss, & Stephens, 2001;Sadeh & Anders, 1993). Some of the factors that have been associated with the timing of this developmental milestone, characterized by a decline in nighttime awakenings, include bedtime parent-child interactions (Anders, Halpern, & Hua, 1992;Lozoff, Wolf, & Davis, 1984), sleep habits (Crowell, Keener, Ginsburg, & Anders, 1987;Lozoff et al, 1984); individual differences in child temperament (Hayes, Parker, Sallinen, & Davare, 2001;Keener, Zeanah, & Anders, 1988;Scher, Tirosh, & Lavie, 1998), sleep-wake rhythm (Burnham, Goodlin-Jones, Gaylor, & Anders, 2002a;Sadeh, Lavie, Scher, Tirosh, & Epstein, 1991), maternal psychological state (Morell, 1999;Scher & Blumberg, 1999), use of sleep aids/security or transitional objects (Burnham et al, 2002a;Winnicott, 1953), and aspects of the sleep environment and sleeping arrangement style (McKenna, Mosko, Dungy, & McAninch, 1990).…”